diff --git "a/27\345\217\262\347\247\200\347\272\242/\347\254\254\344\270\200\346\254\241\344\275\234\344\270\232/.png" "b/27\345\217\262\347\247\200\347\272\242/\347\254\254\344\270\200\346\254\241\344\275\234\344\270\232/.png"
new file mode 100644
index 0000000000000000000000000000000000000000..af4d71e24164e7650c8d6627e59c9aee419e536c
Binary files /dev/null and "b/27\345\217\262\347\247\200\347\272\242/\347\254\254\344\270\200\346\254\241\344\275\234\344\270\232/.png" differ
diff --git "a/27\345\217\262\347\247\200\347\272\242/\347\254\254\344\270\203\346\254\241\344\275\234\344\270\232/SQLQuery7.sql" "b/27\345\217\262\347\247\200\347\272\242/\347\254\254\344\270\203\346\254\241\344\275\234\344\270\232/SQLQuery7.sql"
new file mode 100644
index 0000000000000000000000000000000000000000..8aa2c0fc84f5d08cc4a8afd380b57d0f457f90b5
--- /dev/null
+++ "b/27\345\217\262\347\247\200\347\272\242/\347\254\254\344\270\203\346\254\241\344\275\234\344\270\232/SQLQuery7.sql"
@@ -0,0 +1,115 @@
+create database student
+go
+use student
+go
+create table Class(
+	ClassId int primary key identity,--班级编号
+	ClassName nvarchar(20)	--班级名称
+);
+go
+create table student(
+	studentId int primary key identity,	--学生编号
+	studentName nvarchar(50),			--学生姓名
+	studentSex tinyint not null,		--学生性别
+	studentBirth date,					--出生日期
+	studentAddress nvarchar(255) not null,--地址
+	classId int							--班级编号
+);
+insert into Class(ClassName)
+values ('软件一班'),('软件二班'),('计算机应用技术班')
+
+insert into student(studentName, studentSex, studentBirth, studentAddress, classId)
+values ('刘正',1,'2000-01-01','广西省桂林市七星区空明西路10号鸾东小区',1),
+('黄贵',1,'2001-03-20','江西省南昌市青山湖区艾溪湖南路南150米广阳小区',1),
+('陈美',2,'2000-07-08','福建省龙岩市新罗区曹溪街道万达小区',1);
+select *from student
+select * from Class
+insert into student(studentName, studentSex, studentBirth, studentAddress, classId)
+values ('江文',1,'2000-08-10','安徽省合肥市庐阳区四里河路与潜山路交汇处万科城市之光',2),
+( '钟琪',2,'2001-03-21','湖南省长沙市雨花区红花坡社区',2);
+
+insert into student(studentName, studentSex, studentBirth, studentAddress, classId)
+values ('曾小林',1,'1999-12-10','安徽省合肥市庐阳区四里河路与潜山路交汇处万科城市之光',3),
+('欧阳天天',2,'2000-04-05','湖北省武汉市洪山区友谊大道与二环线交汇处融侨悦府',3),
+('徐长卿',1,'2001-01-30','江苏省苏州市苏州工业园区独墅湖社区',3),
+('李逍遥',1,'1999-11-11','广东省广州市白云区金沙洲岛御洲三街恒大绿洲',3);
+
+insert into student(studentName, studentSex, studentBirth, studentAddress)
+values ('东方不败',3,'1999-12-11' ,'河北省平定州西北四十余里的猩猩滩'),
+('令狐冲',1 ,'2000-08-11', '陕西省渭南市华阴市玉泉路南段');
+select * from student
+create table course (
+courseid int primary key identity ,
+coursename nvarchar(50) not null,
+coutsecredit tinyint not null default 0
+);
+create table classcourse(
+classcourseid int primary key identity,
+classid int references class(classid),
+courseid int references course(courseid)
+); 
+insert into course( coursename, coutsecredit)
+values ('数据库高级应用',3),
+	('javascript编程基础',3),
+	('web前端程序设计基础',4),
+	('动态网页设计.net基础',6)
+select * from  Class
+select * from classcourse
+select *from course
+select * from student
+insert into classcourse(classid, courseid)
+values (1,1),(1,2),(1,3),(1,4),
+       (2,1),(2,2),(2,3),(2,4),
+	   (3,1),(3,2),(3,3),(3,4)
+
+create table score (
+scoreid int primary key identity ,
+studentid int not null references student(studentid),
+courseid int references course(courseid),
+score int not null
+);
+
+insert into score( studentid, courseid, score)
+values (1,1,80),(1,2,78),(1,3,65),(1,4,90),
+(2,1,60),(2,2,77),(2,3,68),(2,4,88),
+(3,1,88),(3,2,45),(3,3,66),(3,4,75),
+(4,1,56),(4,2,80),(4,3,75),(4,4,66),
+(5,1,88),(5,2,79),(5,3,72),(5,4,85),
+(6,1,68),(6,2,88),(6,3,73),(6,4,63),
+(7,1,84),(7,2,90),(7,3,92),(7,4,78),
+(8,1,58),(8,2,59),(8,3,65),(8,4,75),
+(9,1,48),(9,2,67),(9,3,56),(9,4,48)
+select * from course
+select * from score
+select * from Class
+select * from student
+select * from course
+select * from classcourse
+select * from score
+select studentname as 姓名,地址=studentAddress from student
+select top 20percent * from student
+select distinct classid from student
+select studentid as 学生编号 from score
+select * from course order by coutsecredit desc
+select  * from score order by score asc
+select * from student order by studentBirth desc
+select *from student where classid=1
+select *from student where studentsex=2
+select * from student where studentBirth>'2000-01-01' and studentBirth<'2001-01-01';
+select * from student where  studentName like '%欧阳%'
+select * from student where studentAddress like '%桂林市%'
+select * from Student where StudentName like '李__';
+select * from student where classId =1
+select * from classcourse where classid=1
+select sum(score) from score where studentid=1
+select * from score where courseid=1
+select sum(score)as 总分 ,count(0) as 学生总分 from score where courseid=1
+select avg(score) from Score where CourseId = 1;
+select * from score;
+select StudentId, sum(Score) as TotalScore from Score group by StudentId;
+select * from score;
+select StudentId, avg(Score) as 平均分 from Score group by StudentId;
+select StudentId, avg(Score) as 平均分 from Score group by StudentId  order by 平均分 desc;
+select StudentId, avg(Score) as 平均分 from Score
+group by StudentId 
+having avg(score)>80;
\ No newline at end of file
diff --git "a/27\345\217\262\347\247\200\347\272\242/\347\254\254\344\270\211\346\254\241\344\275\234\344\270\232/2023-02-22_195620.png" "b/27\345\217\262\347\247\200\347\272\242/\347\254\254\344\270\211\346\254\241\344\275\234\344\270\232/2023-02-22_195620.png"
new file mode 100644
index 0000000000000000000000000000000000000000..38d982182657ed7f91aee49d644005e9d6aa42f3
Binary files /dev/null and "b/27\345\217\262\347\247\200\347\272\242/\347\254\254\344\270\211\346\254\241\344\275\234\344\270\232/2023-02-22_195620.png" differ
diff --git "a/27\345\217\262\347\247\200\347\272\242/\347\254\254\344\270\211\346\254\241\344\275\234\344\270\232/SQLQuery2.sql" "b/27\345\217\262\347\247\200\347\272\242/\347\254\254\344\270\211\346\254\241\344\275\234\344\270\232/SQLQuery2.sql"
new file mode 100644
index 0000000000000000000000000000000000000000..050848c338eee1b2f5adc5b0fd6e85927edf6270
--- /dev/null
+++ "b/27\345\217\262\347\247\200\347\272\242/\347\254\254\344\270\211\346\254\241\344\275\234\344\270\232/SQLQuery2.sql"
@@ -0,0 +1,33 @@
+create database zuoye1;
+use zuoye1;
+create table class (
+classid int primary key identity(1,1)not null,--班级编号
+classname nvarchar(50) not null,--班级名称
+);
+
+create table student(
+studentid int primary key identity not null,--班级编号
+studentname nvarchar (50)not null, --学生姓名
+studentsex tinyint default 3 not null,--学生性别
+studentbirth date,--学生生日
+studentaddress nvarchar(255) not null,--学生地址
+classid int not null--所属班级id 
+);
+create table course(
+courseld int primary key identity(1,1) not null,--课程编号
+coursename nvarchar(50) not null,--课程名称
+coursecredit tinyint default 0 not null,--课程学分
+);
+
+create table classcourse(
+classcourseid int primary key identity not null,--自增编号
+classid int not null,--班级编号
+courseid  int not null,--课程编号
+);
+
+create table score(
+scoreid int primary key identity not null,--自增编号
+studentid int not null,--学生编号
+courseid int not null,--课程编号
+score int not null,--分数
+);
diff --git "a/27\345\217\262\347\247\200\347\272\242/\347\254\254\344\271\235\346\254\241\344\275\234\344\270\232/SQLQuery.sql" "b/27\345\217\262\347\247\200\347\272\242/\347\254\254\344\271\235\346\254\241\344\275\234\344\270\232/SQLQuery.sql"
new file mode 100644
index 0000000000000000000000000000000000000000..8d32da3996861041d93ed6c3d8115ca3767e69a5
--- /dev/null
+++ "b/27\345\217\262\347\247\200\347\272\242/\347\254\254\344\271\235\346\254\241\344\275\234\344\270\232/SQLQuery.sql"
@@ -0,0 +1,125 @@
+create database Student;
+go
+
+use Student;
+
+--学生信息表
+create table StuInFo(
+	stuNo nvarchar(25) primary key,
+	stuName nvarchar(15) not null,
+	stuAge tinyint not null,
+	stuAddress nvarchar(30) not null,
+	stuSeat int not null,
+	stuSex tinyint default 0 not null
+);
+
+--插入学生信息
+insert into StuInFo(stuNo,stuName,stuAge,stuAddress,stuSeat,stuSex)
+	values('s2501','张秋利',20,'美国硅谷',1,1),
+	('s2502','李斯文',18,'湖北武汉',2,0),
+	('s2503','马文才',22,'湖南长沙',3,1),
+	('s2504','欧阳俊雄',21,'湖北武汉',4,0),
+	('s2505','梅超风',20,'湖北武汉',5,1),
+	('s2506','陈旋风',19,'美国硅谷',6,1),
+	('s2507','陈风',20,'美国硅谷',7,0);
+
+--学生成绩表
+create table stuexam(
+	examNo int primary key identity,
+	stuNo nvarchar(25) references StuInFo(stuNo),
+	writtenExam int not null,
+	labExam int not null
+)
+
+--插入学生成绩
+insert into stuexam(stuNo,writtenExam,labExam)
+	values('s2501',50,70),
+	('s2502',60,65),
+	('s2503',86,85),
+	('s2504',40,80),
+	('s2505',70,90),
+	('s2506',85,90);
+
+--查询学生信息表（stuinfo）中所有列信息，给每列取上中文名称
+select stuName as 学生姓名,stuAge as 年龄,stuAddress as 住址,stuSeat as 机试,stuSex as 性别 from StuInFo;
+
+--查询学生信息表（stuinfo）中的姓名，年龄和地址三列的信息
+select stuName,stuAge,stuAddress from StuInFo;
+
+--查询学生分数表（stuexam）中的学号，笔试和机试三列的信息，并为这三列取中文名字
+select 学号=stuNo,writtenExam as 笔试,labExam 机试 from stuexam;
+
+--查询学生信息表（stuInfo）中的学号，姓名，地址，以及将：姓名+@+地址 组成新列 “邮箱”--查询学生信息表（stuInfo）中的学号，姓名，地址，以及将：姓名+@+地址 组成新列 “邮箱”
+select 学号=stuNo,stuName as 学生姓名,stuAddress as 住址,stuName + '@' + stuAddress as 邮箱 from StuInFo;
+
+--查询学生分数表（stuexam）中的学生的学号，笔试，机试以及总分这四列的信息
+select stuNo,writtenExam,labExam,writtenExam+labExam as 总分 from stuexam;
+
+--查询学生信息表（stuInfo）中学生来自哪几个地方 
+select distinct stuAddress from StuInFo
+
+--查询学生信息表（stuInfo）中学生有哪几种年龄，并为该列取对应的中文列名
+select distinct stuAge as 年龄 from StuInFo
+
+--查询学生信息表（stuInfo）中前3行记录
+select top 3 * from StuInFo
+
+--查询学生信息表（stuInfo）中前4个学生的姓名和座位号
+select top 4 stuName,stuSeat from StuInFo
+
+--查询学生信息表（stuInfo）中一半学生的信息
+select top  50 percent * from StuInFo
+
+--将地址是湖北武汉，年龄是20的学生的所有信息查询出来
+select * from StuInFo where stuAddress='湖北武汉' and stuAge=20
+
+--将机试成绩在60-80之间的信息查询出来，并按照机试成绩降序排列（用两种方法实现）
+select * from stuexam where labExam>=60 and labExam<=80 order by labExam desc
+select * from stuexam where labExam between 60 and 80 order by labExam desc
+
+--查询来自湖北武汉或者湖南长沙的学生的所有信息（用两种方法实现）
+select * from StuInFo where stuAddress='湖北武汉' or stuAddress='湖南长沙'
+select * from StuInFo where stuAddress like '%湖%' --模糊查询
+
+--查询出笔试成绩不在70-90之间的信息,并按照笔试成绩升序排列（用两种方法实现）
+select * from stuexam where writtenExam not between 70 and 90 order by writtenExam asc
+select * from stuexam where writtenExam<70 or writtenExam>90 order by writtenExam asc
+
+--查询年龄没有写的学生所有信息
+select * from StuInFo where stuAge is null
+
+--查询年龄写了的学生所有信息
+select * from StuInFo where stuAge is not null
+
+--查询姓张的学生信息
+select * from StuInFo where stuName like '张%'
+
+--查询学生地址中有‘湖’字的信息
+select * from StuInFo where stuAddress like '%湖%'
+
+--查询姓张但名为一个字的学生信息
+select * from StuInFo where stuName like '张_'
+
+--查询姓名中第三个字为‘俊’的学生的信息，‘俊’后面有多少个字不限制
+select * from StuInFo where stuName like '__俊%'
+
+--按学生的年龄降序显示所有学生信息
+select * from StuInFo order by stuAge desc
+
+--按学生的年龄降序和座位号升序来显示所有学生的信息
+select * from StuInFo order by stuAge desc,stuSeat asc
+
+--显示笔试第一名的学生的考试号，学号，笔试成绩和机试成绩
+select top 1 * from stuexam order by writtenExam desc
+
+--显示机试倒数第一名的学生的考试号，学号，笔试成绩和机试成绩
+select top 1 * from stuexam order by labExam asc
+
+--查询每个地方的学生的平均年龄
+select stuAddress,avg(stuAge) as 平均年龄 from StuInFo group by stuAddress
+
+--查询男女生的分别的年龄总和
+select stuSex,sum(stuAge) 年龄总和 from StuInfo group by StuSex
+
+--查询每个地方的男女生的平均年龄和年龄的总和
+select stuSex,avg(stuAge) 平均年龄,sum(stuAge) as 年龄总和 from StuInfo group by StuSex
\ No newline at end of file
diff --git "a/27\345\217\262\347\247\200\347\272\242/\347\254\254\344\272\214\346\254\241\344\275\234\344\270\232/\347\254\254\344\272\214\346\254\241\344\275\234\344\270\232.docx" "b/27\345\217\262\347\247\200\347\272\242/\347\254\254\344\272\214\346\254\241\344\275\234\344\270\232/\347\254\254\344\272\214\346\254\241\344\275\234\344\270\232.docx"
new file mode 100644
index 0000000000000000000000000000000000000000..ac308564dac8d0471fac9f33008171f2beb4ec0d
Binary files /dev/null and "b/27\345\217\262\347\247\200\347\272\242/\347\254\254\344\272\214\346\254\241\344\275\234\344\270\232/\347\254\254\344\272\214\346\254\241\344\275\234\344\270\232.docx" differ
diff --git "a/27\345\217\262\347\247\200\347\272\242/\347\254\254\344\272\224\346\254\241\344\275\234\344\270\232/SQLQuery9.sql" "b/27\345\217\262\347\247\200\347\272\242/\347\254\254\344\272\224\346\254\241\344\275\234\344\270\232/SQLQuery9.sql"
new file mode 100644
index 0000000000000000000000000000000000000000..0c62a0020195546a4f4fba7e9da84a3a340d61b2
--- /dev/null
+++ "b/27\345\217\262\347\247\200\347\272\242/\347\254\254\344\272\224\346\254\241\344\275\234\344\270\232/SQLQuery9.sql"
@@ -0,0 +1,180 @@
+----80_练习题
+
+create database sxh;
+use sxh;
+create table Class(
+	ClassId int not null identity(1,1),
+	ClassName nvarchar(50) not null
+);
+go
+
+-- 创建学生表，存储学生信息，其中字段保护：学生id、姓名、性别、生日、家庭住址，所属班级id
+create table Student (
+	StudentId int not null identity(1, 1),
+	StudentName nvarchar(50),
+	StudentSex tinyint not null,
+	StudentBirth date,
+	StudentAddress nvarchar(255) not null,
+	Classid int
+);
+go
+
+-- 创建课程表，存储课程信息，其中字段包含：课程id、课程名称、课程学分
+create table Course(
+	CourseId int identity(1,1),
+	CourseName nvarchar(50),
+	CourseCredit int
+);
+go
+
+-- 创建班级课程表，存储班级课程信息，其中字段包含：自增id、班级id、课程id
+create table ClassCourse(
+	ClassCourseId int identity(1,1),
+	ClassId int,
+	CourseId int
+);
+go
+
+-- 创建分数表，存储学生每个课程分数信息，其中字段包含：分数id、学生id、课程id、分数
+create table Score(
+	ScoreId int identity(1,1),
+	StudentId int,
+	CourseId int,
+	Score int
+);
+go
+insert into class(classname)
+values('软件一班'),('软件二班'),('计算机应用技术班')
+       
+
+insert into student(StudentName, StudentSex, StudentBirth, StudentAddress, Classid)
+values ('刘正',1,'2000-01-01','广西省桂林市七星区空明西路10号鸾东小区',1),
+       ('黄贵',1,'2001-03-20','江西省南昌市青山湖区艾溪湖南路南150米广阳小区',1),
+       ('陈美',2,'2000-07-08','福建省龙岩市新罗区曹溪街道万达小区',1)
+
+
+
+
+insert into student(studentname,studentsex,studentbirth,studentaddress,classid)
+values('江文',1,'2000-08-10','安徽省合肥市庐阳区四里河路与潜山路交汇处万科城市之光',2),
+      ('钟琪',2,'2001-03-21','湖南省长沙市雨花区红花坡社区',2)
+
+insert into student(studentname,studentsex,studentbirth,studentaddress,classid)
+values('曾小林',1,'1999-12-10','安徽省合肥市庐阳区四里河路与潜山路交汇处万科城市之光',3),
+      ('欧阳天天',2,'2000-04-05','湖北省武汉市洪山区友谊大道与二环线交汇处融侨悦府',3),
+	  ('徐长卿',1,'2001-01-30','江苏省苏州市苏州工业园区独墅湖社区',3),
+	  ('李逍遥',1,'1999-11-11','广东省广州市白云区金沙洲岛御洲三街恒大绿洲',3)
+
+insert into student(studentname,studentsex,studentbirth,studentaddress)
+values('东方不败',3,'1999-12-11','河北省平定州西北四十余里的猩猩滩'),
+      ('令狐冲',1,' 2000-08-11',' 陕西省渭南市华阴市玉泉路南段')
+insert into course(coursename,coursecredit)
+values('数据库高级应用',3),
+      ('javascript编程基础',3),
+	  ('web前端程序设计基础',4),
+	  ('动态网页设计.net基础',6)
+
+insert into ClassCourse(classid,courseid)values(1,1),(1,2),(1,3),(1,4);
+insert into classcourse(classid,courseid)values(2,1),(2,2),(2,3),(2,4);
+insert into ClassCourse(classid,courseid)values(3,1),(3,2),(3,3),(3,4);
+delete from ClassCourse where(ClassCourseId=1 or ClassCourseId=2 or ClassCourseId=3 or ClassCourseId=4)
+--- 刘正、数据库高级应用、80
+--- 刘正、javascript编程基础、78
+--- 刘正、web前端程序设计基础、65
+--- 刘正、动态网页设计.net基础、90
+insert into score(studentid,courseid,Score)values(1,1,80);
+insert into score(studentid,courseid,Score)values(1,2,78);
+insert into score(studentid,courseid,Score)values(1,3,65);
+insert into score(studentid,courseid,Score)values(1,4,90);
+--- 黄贵、数据库高级应用、60
+--- 黄贵、javascript编程基础、77
+--- 黄贵、web前端程序设计基础、68
+--- 黄贵、动态网页设计.net基础、88
+--- 陈美、数据库高级应用、88
+--- 陈美、javascript编程基础、45
+--- 陈美、web前端程序设计基础、66
+--- 陈美、动态网页设计.net基础、75
+
+insert into score(studentid ,CourseId,score)values(2,1,60);
+insert into score(studentid ,CourseId,score)values(2,2,77);
+insert into score(studentid ,CourseId,score)values(2,3,68);
+insert into score(studentid ,CourseId,score)values(2,4,88);
+
+insert into score(studentid ,CourseId,score)values(3,1,88);
+insert into score(studentid ,CourseId,score)values(3,2,45);
+insert into score(studentid ,CourseId,score)values(3,3,66);
+insert into score(studentid ,CourseId,score)values(3,4,75);
+
+--- 江文、数据库高级应用、56
+--- 江文、javascript编程基础、80
+--- 江文、web前端程序设计基础、75
+--- 江文、动态网页设计.net基础、66
+--- 钟琪、数据库高级应用、88
+--- 钟琪、javascript编程基础、79
+--- 钟琪、web前端程序设计基础、72
+--- 钟琪、动态网页设计.net基础、85
+
+insert into score(studentid ,CourseId,score)values(4,1,56);
+insert into score(studentid ,CourseId,score)values(4,2,80);
+insert into score(studentid ,CourseId,score)values(4,3,75);
+insert into score(studentid ,CourseId,score)values(4,4,66);
+insert into score(studentid ,CourseId,score)values(5,1,88);
+insert into score(studentid ,CourseId,score)values(5,2,79);
+insert into score(studentid ,CourseId,score)values(5,3,72);
+insert into score(studentid ,CourseId,score)values(5,4,85);
+--- 曾小林、数据库高级应用、68
+--- 曾小林、javascript编程基础、88
+--- 曾小林、web前端程序设计基础、73
+--- 曾小林、动态网页设计php基础、63
+--- 欧阳天天、数据库高级应用、84
+--- 欧阳天天、javascript编程基础、90
+--- 欧阳天天、web前端程序设计基础、92
+--- 欧阳天天、动态网页设计php基础、78
+
+insert into score(studentid ,CourseId,score)values(6,1,68);
+insert into score(studentid ,CourseId,score)values(6,2,88);
+insert into score(studentid ,CourseId,score)values(6,3,73);
+insert into score(studentid ,CourseId,score)values(6,4,63);
+insert into score(studentid ,CourseId,score)values(7,1,84);
+insert into score(studentid ,CourseId,score)values(7,2,90);
+insert into score(studentid ,CourseId,score)values(7,3,92);
+insert into score(studentid ,CourseId,score)values(7,4,78);
+
+--- 徐长卿、数据库高级应用、58
+--- 徐长卿、javascript编程基础、59
+--- 徐长卿、web前端程序设计基础、65
+--- 徐长卿、动态网页设计php基础、75
+--- 李逍遥、数据库高级应用、48
+--- 李逍遥、javascript编程基础、67
+--- 李逍遥、web前端程序设计基础、71
+--- 李逍遥、动态网页设计.net基础、56
+--- 李逍遥、数据库高级应用、48
+
+insert into score(studentid ,CourseId,score)values(8,1,58);
+insert into score(studentid ,CourseId,score)values(8,2,59);
+insert into score(studentid ,CourseId,score)values(8,3,65);
+insert into score(studentid ,CourseId,score)values(8,4,75);
+insert into score(studentid ,CourseId,score)values(9,1,48);
+insert into score(studentid ,CourseId,score)values(9,2,67);
+insert into score(studentid ,CourseId,score)values(9,3,71);
+insert into score(studentid ,CourseId,score)values(9,4,56);
+insert into score(studentid ,CourseId,score)values(9,1,48);
+
+delete from score where (scoreid=37);
+update student set studentbirth='2000-04-06' where (studentid=7);
+update score set score=61 where(scoreid=30);
+
+
+
+
+
+
+
+
+
+select * from class;
+select * from student;
+select * from course;
+select * from ClassCourse;
+select * from score;
+
diff --git "a/27\345\217\262\347\247\200\347\272\242/\347\254\254\345\205\253\346\254\241\344\275\234\344\270\232/\344\275\234\344\270\232.sql" "b/27\345\217\262\347\247\200\347\272\242/\347\254\254\345\205\253\346\254\241\344\275\234\344\270\232/\344\275\234\344\270\232.sql"
new file mode 100644
index 0000000000000000000000000000000000000000..8d32da3996861041d93ed6c3d8115ca3767e69a5
--- /dev/null
+++ "b/27\345\217\262\347\247\200\347\272\242/\347\254\254\345\205\253\346\254\241\344\275\234\344\270\232/\344\275\234\344\270\232.sql"
@@ -0,0 +1,125 @@
+create database Student;
+go
+
+use Student;
+
+--学生信息表
+create table StuInFo(
+	stuNo nvarchar(25) primary key,
+	stuName nvarchar(15) not null,
+	stuAge tinyint not null,
+	stuAddress nvarchar(30) not null,
+	stuSeat int not null,
+	stuSex tinyint default 0 not null
+);
+
+--插入学生信息
+insert into StuInFo(stuNo,stuName,stuAge,stuAddress,stuSeat,stuSex)
+	values('s2501','张秋利',20,'美国硅谷',1,1),
+	('s2502','李斯文',18,'湖北武汉',2,0),
+	('s2503','马文才',22,'湖南长沙',3,1),
+	('s2504','欧阳俊雄',21,'湖北武汉',4,0),
+	('s2505','梅超风',20,'湖北武汉',5,1),
+	('s2506','陈旋风',19,'美国硅谷',6,1),
+	('s2507','陈风',20,'美国硅谷',7,0);
+
+--学生成绩表
+create table stuexam(
+	examNo int primary key identity,
+	stuNo nvarchar(25) references StuInFo(stuNo),
+	writtenExam int not null,
+	labExam int not null
+)
+
+--插入学生成绩
+insert into stuexam(stuNo,writtenExam,labExam)
+	values('s2501',50,70),
+	('s2502',60,65),
+	('s2503',86,85),
+	('s2504',40,80),
+	('s2505',70,90),
+	('s2506',85,90);
+
+--查询学生信息表（stuinfo）中所有列信息，给每列取上中文名称
+select stuName as 学生姓名,stuAge as 年龄,stuAddress as 住址,stuSeat as 机试,stuSex as 性别 from StuInFo;
+
+--查询学生信息表（stuinfo）中的姓名，年龄和地址三列的信息
+select stuName,stuAge,stuAddress from StuInFo;
+
+--查询学生分数表（stuexam）中的学号，笔试和机试三列的信息，并为这三列取中文名字
+select 学号=stuNo,writtenExam as 笔试,labExam 机试 from stuexam;
+
+--查询学生信息表（stuInfo）中的学号，姓名，地址，以及将：姓名+@+地址 组成新列 “邮箱”--查询学生信息表（stuInfo）中的学号，姓名，地址，以及将：姓名+@+地址 组成新列 “邮箱”
+select 学号=stuNo,stuName as 学生姓名,stuAddress as 住址,stuName + '@' + stuAddress as 邮箱 from StuInFo;
+
+--查询学生分数表（stuexam）中的学生的学号，笔试，机试以及总分这四列的信息
+select stuNo,writtenExam,labExam,writtenExam+labExam as 总分 from stuexam;
+
+--查询学生信息表（stuInfo）中学生来自哪几个地方 
+select distinct stuAddress from StuInFo
+
+--查询学生信息表（stuInfo）中学生有哪几种年龄，并为该列取对应的中文列名
+select distinct stuAge as 年龄 from StuInFo
+
+--查询学生信息表（stuInfo）中前3行记录
+select top 3 * from StuInFo
+
+--查询学生信息表（stuInfo）中前4个学生的姓名和座位号
+select top 4 stuName,stuSeat from StuInFo
+
+--查询学生信息表（stuInfo）中一半学生的信息
+select top  50 percent * from StuInFo
+
+--将地址是湖北武汉，年龄是20的学生的所有信息查询出来
+select * from StuInFo where stuAddress='湖北武汉' and stuAge=20
+
+--将机试成绩在60-80之间的信息查询出来，并按照机试成绩降序排列（用两种方法实现）
+select * from stuexam where labExam>=60 and labExam<=80 order by labExam desc
+select * from stuexam where labExam between 60 and 80 order by labExam desc
+
+--查询来自湖北武汉或者湖南长沙的学生的所有信息（用两种方法实现）
+select * from StuInFo where stuAddress='湖北武汉' or stuAddress='湖南长沙'
+select * from StuInFo where stuAddress like '%湖%' --模糊查询
+
+--查询出笔试成绩不在70-90之间的信息,并按照笔试成绩升序排列（用两种方法实现）
+select * from stuexam where writtenExam not between 70 and 90 order by writtenExam asc
+select * from stuexam where writtenExam<70 or writtenExam>90 order by writtenExam asc
+
+--查询年龄没有写的学生所有信息
+select * from StuInFo where stuAge is null
+
+--查询年龄写了的学生所有信息
+select * from StuInFo where stuAge is not null
+
+--查询姓张的学生信息
+select * from StuInFo where stuName like '张%'
+
+--查询学生地址中有‘湖’字的信息
+select * from StuInFo where stuAddress like '%湖%'
+
+--查询姓张但名为一个字的学生信息
+select * from StuInFo where stuName like '张_'
+
+--查询姓名中第三个字为‘俊’的学生的信息，‘俊’后面有多少个字不限制
+select * from StuInFo where stuName like '__俊%'
+
+--按学生的年龄降序显示所有学生信息
+select * from StuInFo order by stuAge desc
+
+--按学生的年龄降序和座位号升序来显示所有学生的信息
+select * from StuInFo order by stuAge desc,stuSeat asc
+
+--显示笔试第一名的学生的考试号，学号，笔试成绩和机试成绩
+select top 1 * from stuexam order by writtenExam desc
+
+--显示机试倒数第一名的学生的考试号，学号，笔试成绩和机试成绩
+select top 1 * from stuexam order by labExam asc
+
+--查询每个地方的学生的平均年龄
+select stuAddress,avg(stuAge) as 平均年龄 from StuInFo group by stuAddress
+
+--查询男女生的分别的年龄总和
+select stuSex,sum(stuAge) 年龄总和 from StuInfo group by StuSex
+
+--查询每个地方的男女生的平均年龄和年龄的总和
+select stuSex,avg(stuAge) 平均年龄,sum(stuAge) as 年龄总和 from StuInfo group by StuSex
\ No newline at end of file
diff --git "a/27\345\217\262\347\247\200\347\272\242/\347\254\254\345\205\255\346\254\241\344\275\234\344\270\232/SQLQuery6.sql" "b/27\345\217\262\347\247\200\347\272\242/\347\254\254\345\205\255\346\254\241\344\275\234\344\270\232/SQLQuery6.sql"
new file mode 100644
index 0000000000000000000000000000000000000000..423eb9df0674ae80f39fd52ca84193fa746dfa15
--- /dev/null
+++ "b/27\345\217\262\347\247\200\347\272\242/\347\254\254\345\205\255\346\254\241\344\275\234\344\270\232/SQLQuery6.sql"
@@ -0,0 +1,112 @@
+create database student8
+go
+use student8
+go
+create table Class(
+	ClassId int primary key identity,--班级编号
+	ClassName nvarchar(20)	--班级名称
+);
+go
+create table student(
+	studentId int primary key identity,	--学生编号
+	studentName nvarchar(50),			--学生姓名
+	studentSex tinyint not null,		--学生性别
+	studentBirth date,					--出生日期
+	studentAddress nvarchar(255) not null,--地址
+	classId int							--班级编号
+);
+insert into Class(ClassName)
+values ('软件一班'),('软件二班'),('计算机应用技术班')
+
+insert into student(studentName, studentSex, studentBirth, studentAddress, classId)
+values ('刘正',1,'2000-01-01','广西省桂林市七星区空明西路10号鸾东小区',1),
+('黄贵',1,'2001-03-20','江西省南昌市青山湖区艾溪湖南路南150米广阳小区',1),
+('陈美',2,'2000-07-08','福建省龙岩市新罗区曹溪街道万达小区',1);
+select *from student
+select * from Class
+insert into student(studentName, studentSex, studentBirth, studentAddress, classId)
+values ('江文',1,'2000-08-10','安徽省合肥市庐阳区四里河路与潜山路交汇处万科城市之光',2),
+( '钟琪',2,'2001-03-21','湖南省长沙市雨花区红花坡社区',2);
+
+insert into student(studentName, studentSex, studentBirth, studentAddress, classId)
+values ('曾小林',1,'1999-12-10','安徽省合肥市庐阳区四里河路与潜山路交汇处万科城市之光',3),
+('欧阳天天',2,'2000-04-05','湖北省武汉市洪山区友谊大道与二环线交汇处融侨悦府',3),
+('徐长卿',1,'2001-01-30','江苏省苏州市苏州工业园区独墅湖社区',3),
+('李逍遥',1,'1999-11-11','广东省广州市白云区金沙洲岛御洲三街恒大绿洲',3);
+
+insert into student(studentName, studentSex, studentBirth, studentAddress)
+values ('东方不败',3,'1999-12-11' ,'河北省平定州西北四十余里的猩猩滩'),
+('令狐冲',1 ,'2000-08-11', '陕西省渭南市华阴市玉泉路南段');
+select * from student
+create table course (
+courseid int primary key identity ,
+coursename nvarchar(50) not null,
+coutsecredit tinyint not null default 0
+);
+create table classcourse(
+classcourseid int primary key identity,
+classid int references class(classid),
+courseid int references course(courseid)
+); 
+insert into course( coursename, coutsecredit)
+values ('数据库高级应用',3),
+	('javascript编程基础',3),
+	('web前端程序设计基础',4),
+	('动态网页设计.net基础',6)
+select * from  Class
+select * from classcourse
+select *from course
+select * from student
+insert into classcourse(classid, courseid)
+values (1,1),(1,2),(1,3),(1,4),
+       (2,1),(2,2),(2,3),(2,4),
+	   (3,1),(3,2),(3,3),(3,4)
+
+create table score (
+scoreid int primary key identity ,
+studentid int not null references student(studentid),
+courseid int references course(courseid),
+score int not null
+);
+
+insert into score( studentid, courseid, score)
+values (1,1,80),(1,2,78),(1,3,65),(1,4,90),
+(2,1,60),(2,2,77),(2,3,68),(2,4,88),
+(3,1,88),(3,2,45),(3,3,66),(3,4,75),
+(4,1,56),(4,2,80),(4,3,75),(4,4,66),
+(5,1,88),(5,2,79),(5,3,72),(5,4,85),
+(6,1,68),(6,2,88),(6,3,73),(6,4,63),
+(7,1,84),(7,2,90),(7,3,92),(7,4,78),
+(8,1,58),(8,2,59),(8,3,65),(8,4,75),
+(9,1,48),(9,2,67),(9,3,56),(9,4,48)
+select * from course
+select * from score
+select * from Class
+select * from student
+select * from course
+select * from classcourse
+select * from score
+select studentname as 姓名,地址=studentAddress from student
+select top 20percent * from student
+select distinct classid from student
+select studentid as 学生编号 from score
+select * from course order by coutsecredit desc
+select  * from score order by score asc
+select * from student order by studentBirth desc
+select *from student where classid=1
+select *from student where studentsex=2
+select * from student where studentBirth>'2000-01-01' and studentBirth<'2001-01-01';
+select * from student where  studentName like '%欧阳%'
+select * from student where studentAddress like '%桂林市%'
+select * from Student where StudentName like '李__';
+select * from student where classId =1
+select * from classcourse where classid=1
+select sum(score) from score where studentid=1
+select * from score where courseid=1
+select sum(score)as 总分 ,count(0) as 学生总分 from score where courseid=1
+select avg(score) from Score where CourseId = 1;
+select * from score;
+select StudentId, sum(Score) as TotalScore from Score group by StudentId;
+select * from score;
+select StudentId, avg(Score) as TotalScore from Score group by StudentId;
+
diff --git "a/27\345\217\262\347\247\200\347\272\242/\347\254\254\345\215\201\344\270\200\346\254\241\344\275\234\344\270\232/\346\234\237\346\234\253\347\255\224\351\242\230\344\275\234\344\270\232.sql" "b/27\345\217\262\347\247\200\347\272\242/\347\254\254\345\215\201\344\270\200\346\254\241\344\275\234\344\270\232/\346\234\237\346\234\253\347\255\224\351\242\230\344\275\234\344\270\232.sql"
new file mode 100644
index 0000000000000000000000000000000000000000..450265913aee3bc5701c0ff7ce1fa12768e6f620
--- /dev/null
+++ "b/27\345\217\262\347\247\200\347\272\242/\347\254\254\345\215\201\344\270\200\346\254\241\344\275\234\344\270\232/\346\234\237\346\234\253\347\255\224\351\242\230\344\275\234\344\270\232.sql"
@@ -0,0 +1,58 @@
+create database StarManager
+go
+use StarManager
+go
+
+-- 2. 正确建立数据表结构并添加约束
+create table StarType(
+	STNO int primary key identity,
+	SType nvarchar(20)
+)
+go
+create table StarInfo(
+	SNO int primary key identity,
+	SName nvarchar(20) not null,
+	SAge int not null,
+	SHobby nvarchar(20),
+	SNative nvarchar(20) default '中国大陆',
+	STNO int references StarType(STNO)
+)
+go
+
+-- 3. 正确为数据表添加数据
+insert into StarType(SType)
+	values('体育明星'),
+	('IT明星'),
+	('相声演员'),
+	('影视明星'),
+	('歌手')
+go
+insert into StarInfo(SName,SAge,SHobby,SNative,STNO)
+	values('梅西',36,'足球','阿根廷',1),
+	('科比',35,'篮球','美国',1),
+	('蔡景现',40,'敲代码','中国',2),
+	('马斯克',36,'造火箭','美国',2),
+	('郭德纲',50,'相声','中国',3),
+	('黄铮',41,'拼多多','中国',2),
+	('邓紫棋',33,'音乐','中国',5),
+	('周杰伦',39,'创作','中国',5),
+	('詹姆斯',34,'篮球','美国',1)
+go
+
+-- 4. 查询年龄最大的3个明星的姓名、特技、籍贯信息和明星类型，要求使用别名显示列名（7分）
+select top 3 SName 姓名,SHobby 特技,SNative 籍贯,STNO 明星类型 from StarInfo order by SAge desc
+
+-- 5. 按明星类型编号分类查询明星人数、明星平均年龄，显示明星人数小于2的分组信息，要求使用别名显示列名（10分）
+select count(*) 明星人数,avg(SAge) 明星平均年龄 from StarInfo group by STNO having count(*)<2
+
+-- 6. 查询明星类型为‘体育明星’中年纪最大的姓名，特技，籍贯信息，要求显示列别名（8分）
+select top 1 SName 姓名,SHobby 特技,SNative 籍贯 from StarInfo where STNO=1 order by SAge desc
+
+-- 7. 查询名字是三个字，且最后一个字是“斯”字的明星。（8分）
+select * from StarInfo where SName like '%斯'
+
+-- 8. 查询出年龄在25到40之间（包含25和40）的明星，按年龄逆序排序，要展示的字段：姓名、年龄、籍贯、明星类型。（10分）
+select SName,SAge,SNative,STNO from StarInfo where SAge between 25 and 40
+
+-- 9. 查询出籍贯是中国的明星的人数（包含中国大陆、中国香港、中国台湾）。（7分）
+select * from StarInfo where SNative like '%中国%'
diff --git "a/27\345\217\262\347\247\200\347\272\242/\347\254\254\345\215\201\344\272\214\346\254\241\344\275\234\344\270\232/\345\244\215\344\271\240\344\270\200.sql" "b/27\345\217\262\347\247\200\347\272\242/\347\254\254\345\215\201\344\272\214\346\254\241\344\275\234\344\270\232/\345\244\215\344\271\240\344\270\200.sql"
new file mode 100644
index 0000000000000000000000000000000000000000..b2ee61f12e9d73e7865f7ba9fa8b259dc8cebe3b
--- /dev/null
+++ "b/27\345\217\262\347\247\200\347\272\242/\347\254\254\345\215\201\344\272\214\346\254\241\344\275\234\344\270\232/\345\244\215\344\271\240\344\270\200.sql"
@@ -0,0 +1,39 @@
+create database GoodsDB
+go
+use GoodsDB
+
+create table GoodsType(
+	[TypeID] int primary key identity(1,1) not null,
+	[TypeName] nvarchar(20) not null
+)
+
+create table GoodsInfo(
+	GoodsID int primary key identity not null,
+	GoodsName nvarchar(20) not null,
+	GoodsColor nvarchar(20) not null,
+	GoodsBrand nvarchar(20),
+	GoodsMoney money not null,
+	TypeID int references GoodsType(TypeID)
+)
+
+insert GoodsType(TypeName)
+	values('服装内衣'),
+		('鞋包服饰'),
+		('手机数码')
+
+insert GoodsInfo(GoodsName,GoodsColor,GoodsBrand,GoodsMoney,TypeID)
+	values('提花小西装','红色','菲曼琪',300,1),
+		('百搭短裤','绿色','哥弟',100,1),
+		('无袖背心','白色','阿依莲',700,1),
+		('低帮休闲鞋','红色','菲曼琪',900,2),
+		('中跟单鞋','绿色','哥弟',400,2),
+		('平底鞋','白色','阿依莲',200,2),
+		('迷你照相机','红色','尼康',500,3),
+		('硬盘','黑色','希捷',600,3),
+		('显卡','黑色','技嘉',800,3)
+--查询价格最贵的商品名称，商品颜色和商品价格，要求使用别名显示列名
+select top 1 GoodsName 商品名称,GoodsColor 商品颜色,GoodsMoney 商品价格 from GoodsInfo order by GoodsMoney desc
+--按商品类型编号分组查询商品最高价格，最低价格和平均价格，要求使用别名显示列名
+select max(GoodsMoney) 最高价格,min(GoodsMoney) 最低价格,avg(GoodsMoney) 平均价格 from GoodsInfo group by TypeID
+--查询商品信息所有列，要求商品颜色为红色，价格在300~600之间
+select * from GoodsInfo where GoodsColor='红色' and GoodsMoney between 300 and 600
\ No newline at end of file
diff --git "a/27\345\217\262\347\247\200\347\272\242/\347\254\254\345\215\201\344\272\214\346\254\241\344\275\234\344\270\232/\345\244\215\344\271\240\351\242\230\344\270\211.sql" "b/27\345\217\262\347\247\200\347\272\242/\347\254\254\345\215\201\344\272\214\346\254\241\344\275\234\344\270\232/\345\244\215\344\271\240\351\242\230\344\270\211.sql"
new file mode 100644
index 0000000000000000000000000000000000000000..01f0b216853132333a010ba6a0b83ac4ae20363f
--- /dev/null
+++ "b/27\345\217\262\347\247\200\347\272\242/\347\254\254\345\215\201\344\272\214\346\254\241\344\275\234\344\270\232/\345\244\215\344\271\240\351\242\230\344\270\211.sql"
@@ -0,0 +1,38 @@
+create database StarManagerDB
+go
+use StarManagerDB
+
+create table StarType(
+	T_NO int primary key identity not null,
+	T_NAME nvarchar(20)
+)
+
+create table StarInfo(
+	S_NO int primary key identity not null,
+	S_NAME nvarchar(20) not null,
+	S_AGE int not null,
+	S_HOBBY nvarchar(20),
+	S_NATIVE nvarchar(20) default '中国大陆',
+	S_T_NO int references StarType(T_NO)
+)
+
+insert into StarType(T_NAME)
+	values('体育明星'),
+	('IT明星'),
+	('相声演员')
+
+insert into StarInfo(S_NAME,S_AGE,S_HOBBY,S_NATIVE,S_T_NO)
+	values('梅西',30,'射门','阿根廷',1),
+	('科比',35,'过人','美国',1),
+	('蔡景现',40,'敲代码','中国',2),
+	('马斯克',36,'造火箭','外星人',2),
+	('郭德纲',50,'相声','中国',3),
+	('黄铮',41,'拼多多','中国',2)
+
+--查询数据
+--查询年龄最大的3个明星的姓名，特技和籍贯信息，要求使用别名显示列名
+select top 3 S_NAME 姓名,S_HOBBY 特技,S_NATIVE 籍贯 from StarInfo order by S_AGE desc
+--按明星类型编号分类查询明星人数，明星平均年龄，显示明星人数大于2的分组信息，要求使用别名显示列名
+select count(*) 明星人数,avg(S_AGE) 平均年龄 from StarInfo group by S_T_NO having count(*)>2
+--查询明星类型为“体育明星”中年龄最大的姓名、特技、籍贯信息，要求显示列别名
+select top 1 S_NAME 姓名,S_AGE 年龄,S_HOBBY 特技,S_NATIVE 籍贯 from StarInfo where S_T_NO=1 order by S_AGE desc
\ No newline at end of file
diff --git "a/27\345\217\262\347\247\200\347\272\242/\347\254\254\345\215\201\344\272\214\346\254\241\344\275\234\344\270\232/\345\244\215\344\271\240\351\242\230\344\272\214.sql" "b/27\345\217\262\347\247\200\347\272\242/\347\254\254\345\215\201\344\272\214\346\254\241\344\275\234\344\270\232/\345\244\215\344\271\240\351\242\230\344\272\214.sql"
new file mode 100644
index 0000000000000000000000000000000000000000..23a857fe5d65f24f08e007a984356408b42301b0
--- /dev/null
+++ "b/27\345\217\262\347\247\200\347\272\242/\347\254\254\345\215\201\344\272\214\346\254\241\344\275\234\344\270\232/\345\244\215\344\271\240\351\242\230\344\272\214.sql"
@@ -0,0 +1,36 @@
+create database HOUSE_DB
+go
+use HOUSE_DB
+
+create table HOUSE_TYPE(
+	[type_id] int primary key identity not null,
+	[type_name] varchar(50) not null
+)
+
+create table HOUSE(
+	house_id int primary key identity not null,
+	house_name varchar(50) not null,
+	house_price float default 0 not null,
+	[type_id] int references HOUSE_TYPE([type_id]) not null
+)
+
+insert into HOUSE_TYPE(type_name)
+	values('小户型'),
+	('经济型'),
+	('别墅')
+
+insert into HOUSE(house_name,house_price,type_id)
+	values('房屋1',2000,1),
+	('房屋2',3500,2),
+	('房屋3',5500,3)
+	--查询所有房屋信息
+select * from HOUSE
+--使用模糊查询包含“型”字的房屋类型信息
+select * from HOUSE_TYPE where type_name like '%型%'
+--查询出房屋的名称和租金，并且按照租金降序排序
+select house_name 房屋名称,house_price 租金 from HOUSE order by house_price desc
+--使用连接查询，查询信息，显示房屋名称和房屋类型名称
+select house_name 房屋名称,[type_name] 房屋类型 from HOUSE
+	join HOUSE_TYPE on HOUSE.type_id=HOUSE_TYPE.type_id
+--查询所有房屋中月租最高的房屋，显示最高的租金和房屋名称
+select top 1 house_name 房屋名称,max(house_price) 租金 from HOUSE group by house_name order by max(house_price) desc
\ No newline at end of file
diff --git "a/27\345\217\262\347\247\200\347\272\242/\347\254\254\345\215\201\346\254\241\344\275\234\344\270\232/\344\275\234\344\270\232.sql" "b/27\345\217\262\347\247\200\347\272\242/\347\254\254\345\215\201\346\254\241\344\275\234\344\270\232/\344\275\234\344\270\232.sql"
new file mode 100644
index 0000000000000000000000000000000000000000..fd49fe43b15144617fcbb7d9a374e799097eb593
--- /dev/null
+++ "b/27\345\217\262\347\247\200\347\272\242/\347\254\254\345\215\201\346\254\241\344\275\234\344\270\232/\344\275\234\344\270\232.sql"
@@ -0,0 +1,127 @@
+create database bbs3
+go
+use bbs3
+
+--用户信息表（bbsUsers）
+create table bbsUsers(
+	[UID] int primary key identity,
+	uName varchar(10) unique not null,
+	uSex varchar(2) not null check(uSex='男' or uSex='女'),
+	uAge int not null check(uAge between 15 and 60),
+	uPoint int not null check(uPoint>=0)
+)
+
+--版块表（bbsSection）
+create table bbsSection(
+	[sID] int primary key identity,
+	sName varchar(10) not null,
+	sUid int references bbsUsers(UID)
+)
+
+--主贴表（bbsTopic）
+create table bbsTopic(
+	tID int primary key identity,
+	tUID int references bbsUsers([UID]),
+	tSID int references bbsSection([sID]),
+	tTitle varchar(100) not null,
+	tMsg text not null,
+	tTime datetime,
+	tCount int
+)
+
+--回帖表（bbsReply）
+create table bbsReply(
+	rID int primary key identity,
+	rUID int references bbsUsers([UID]),
+	rTID int references bbsTopic(tID),
+	rMsg text not null,
+	rTime datetime
+)
+
+--插入数据
+insert into bbsUsers(uName,uSex,uAge,uPoint)
+	values('小雨点','女',20,0),
+		('逍遥','男',18,4),
+		('七年级生','男',19,2)
+
+select * from bbsUsers
+
+insert into bbsSection(sName,sUid)
+	values('技术交流',1),
+		('读书世界',3),
+		('生活百科',1),
+		('八卦区',3)
+
+select * from bbsSection
+
+--添加主贴
+insert into bbsTopic(tUID,tSID,tTitle,tMsg,tTime,tCount)
+	values(2,4,'范跑跑','谁是范跑跑','2008-7-8',1),
+		(3,1,'.NET','与JAVA的区别是什么呀？','2008-9-1',2),
+		(1,3,'今年夏天最流行什么','有谁知道今年夏天最流行什么呀?','2008-9-10',0)
+
+select * from bbsTopic
+
+--自定义回帖
+insert into bbsReply(rUID,rTID,rMsg,rTime)
+	values(1,1,'不知道','2008-7-9'),
+		(3,1,'不清楚','2008-9-2'),
+		(3,2,'不了解','2008-9-11')
+
+select * from bbsReply
+
+--删除“逍遥” 先删除引用主键的外键数据行 
+delete from bbsReply where rTID=1
+delete from bbsTopic where tUID=2
+delete from bbsUsers where [UID]=2
+select * from bbsUsers
+
+--因为小雨点发帖较多，将其积分增加10分
+update bbsUsers set uPoint=uPoint+10 where [UID]=1
+select * from bbsUsers
+
+--删除板块“生活百科”
+delete bbsTopic where tSID=3
+delete bbsSection where sID=3
+select * from bbsSection
+
+--将所有的回帖删除
+Delete from bbsReply where 1=1
+
+
+--查询练习
+--在主贴表中统计每个版块的发帖总数
+select tSID as 板块编号,count(*) as 发帖总数 from bbsTopic group by tSID
+
+--在回帖表中统计每个主贴的回帖总数量
+select rTID as 主贴编号,count(*) as 回帖数量 from bbsReply group by rTID
+
+--在主贴表中统计每个用户的发的主帖的总数
+select tUID as 发帖人编号,count(tID) as 发帖总数 from bbsTopic group by tUID
+
+--在主贴表中统计每个用户发的主贴的回复数量总和
+select tUID as 发帖人编号,sum(tCount) as 回复数量 from bbsTopic group by tUID
+
+--在主贴表中查询每个版块的主贴的平均回复数量大于3的版块的平均回复数量
+select tsid as 板块编号,avg(tCount) as 平均回复数量 from bbsTopic
+	group by tSID
+	having avg(tCount)>3
+
+--在用户信息表中查询出积分最高的用户的用户名，性别，年龄和积分
+select top 1 uName,uSex,uAge,uPoint from bbsUsers
+	order by uPoint desc
+
+--在主贴表中（bbsTopic）中将帖子的内容或标题中有“快乐”两字的记录查询出来
+select * from bbsTopic where tTitle like '%快乐%' or tMsg like '%快乐%'
+
+--在用户信息表（bbsUsers）中将用户年龄在15-20之间并且积分在10分以上的优秀用户查询出来（用多种方法实现）
+select * from bbsUsers where uAge between 15 and 20 and uPoint>10
+
+--在用户信息表（bbsUsers）中将用户名的第一个字为“小”，第三字为“大”的用户信息查询出来
+select * from bbsUsers where uName like '小%' or uName like '__大%' 
+
+--在主贴表（bbsTopic）中将在2008-9-10 12:00:00 以后发的并且回复数量在10以上的帖子的标题和内容查询出来，并且为列取上对应的中文列名
+select tTitle as 帖子标题, tMsg as 帖子内容 from bbsTopic where tTime>'2008-9-10 12:00:00 ' and tCount>10
+
+--在主贴表（bbsTopic）中将帖子的标题是以‘！’结尾的帖子的发帖人编号和回复数量查询出来
+select * from bbsTopic where tTitle like '%！'
\ No newline at end of file
diff --git "a/27\345\217\262\347\247\200\347\272\242/\347\254\254\345\233\233\346\254\241\344\275\234\344\270\232/SQLQuery4.sql" "b/27\345\217\262\347\247\200\347\272\242/\347\254\254\345\233\233\346\254\241\344\275\234\344\270\232/SQLQuery4.sql"
new file mode 100644
index 0000000000000000000000000000000000000000..a59df8da8e67691f4f7ef351ac6f8e99861bab5c
--- /dev/null
+++ "b/27\345\217\262\347\247\200\347\272\242/\347\254\254\345\233\233\346\254\241\344\275\234\344\270\232/SQLQuery4.sql"
@@ -0,0 +1,120 @@
+create database czy;
+go
+use czy;
+go
+create table class1(
+classid int identity not null primary key,--班级编号
+classname nvarchar(50) not null ,--班级名称
+);
+
+create table student1(
+studentid int identity not null primary key,--学生编号
+studentname nvarchar(50) not null,--学生姓名
+studentsex tinyint not null default 3,--学生性别
+studentbirth date,--学生生日
+studentaddress nvarchar(255) not null,--学生地址
+classid int not null --所属班级id
+);
+
+
+create table course1(
+courseid int identity not null primary key,--课程编导
+coursename nvarchar(50) not null,--课程名称
+coursecredit tinyint not null default 0--课程学分
+); 
+alter table course1 add classid nvarchar;
+alter table course1 drop column classid;
+
+create table classcourse1(
+classcourseid int identity not null primary key ,--自增编号
+classid int not null,--班级编号
+courseid int not null --课程编号
+);
+
+
+create table score1(
+scoreid int identity not null primary key ,--自增编号
+studentid int not null,--学生编号
+courseid int not null,--课程编号
+score int not null --分数
+);
+
+insert into class1(classname)
+ values ('软件技术一班'),('软件技术二班'),('计算机应用技术班');
+
+ select * from class1;
+
+ insert into student1(studentname,studentsex,studentbirth,studentaddress,classid)
+ values ('刘正',1,'2000-01-01','广西省桂林市七星区空明西路10号鸾东小区',1),
+        ('黄贵',1,'2001-03-20','江西省南昌市青山湖区艾溪湖南路南150米广阳小区',1),
+		('陈美',2,'2000-07-08','福建省龙岩市新罗区曹溪街道万达小区',1);
+ insert into student1(studentname,studentsex,studentbirth,studentaddress,classid)
+ values ('江文',1,'2000-08-10','安徽省合肥市庐阳区四里河路与潜山路交汇处万科城市之光',2),
+        ('钟琪',2,'2001-03-21','湖南省长沙市雨花区红花坡社区',2);
+insert into student1 (studentname,studentsex,studentbirth,studentaddress,classid)
+values  ('曾小林',1,'1999-12-10','安徽省合肥市庐阳区四里河路与潜山路交汇处万科城市之光',3),
+        ('欧阳天天',2,'2000-04-05','湖北省武汉市洪山区友谊大道与二环线交汇处融侨悦府',3),
+		('徐长卿',1,'2001-01-30','江苏省苏州市苏州工业园区独墅湖社区',3),
+		('李逍遥',1,'1999-11-11','广东省广州市白云区金沙洲岛御洲三街恒大绿洲',3);
+insert into student1 (studentname,studentsex,studentbirth,studentaddress,classid)
+values ('东方不败',3,'1999-12-11','河北省平定州西北四十余里的猩猩滩',0),
+       ('令狐冲',1,'2000-08-11','陕西省渭南市华阴市玉泉路南段',0);
+
+select * from student1;
+
+insert into course1(coursename,coursecredit)
+values ('数据库应用高级','3'),
+       (' javascript编程基础',3),
+       (' web前端程序设计基础',4),
+       ('动态网页设计.net基础',6);
+
+select * from course1;
+
+insert into classcourse1(classid, courseid)
+values (1,1),(1,2),(1,3),(1,4),
+       (2,1),(2,2),(2,3),(2,4),
+	   (3,1),(3,2),(3,3),(3,4);
+
+select * from classcourse1;
+
+insert into score1(studentid, courseid ,score )
+values ('1','1',     80),
+       ('1','2', 78),
+       ('1','3', 65),
+       ('1',' 4', 90),
+       ('2','1',      60),
+       ('2',' 2',  77),
+       ('2',' 3', 68),
+       ('2',' 4',88),
+       ('3',' 1',      88),
+       ('3',' 2',  45),
+       ('3',' 3', 66),
+       ('3',' 4',75),
+       ('4',' 1',      56),
+       ('4',' 2',  80),
+       ('4','3', 75),
+       ('4',' 4',66),
+       ('5','1',      88),
+       ('5',' 2',  79),
+       ('5','3', 72),
+       ('5',' 4',85),
+       ('6','     1',68),		 
+       ('6','2',88),
+       ('6','3',73),
+       ('6','4',63),
+       ('7',' 1',84),
+       ('7','2',90),
+       ('7','3',92),
+       ('7','4',78),
+       ('8','    1',58),
+       ('8','  2',59),
+       ('8','  3',65),
+       ('8','  4',75),
+       ('8','    1',48),
+       ('9','  2',67),
+       ('9',' 3',71),
+       ('9',' 4',56),
+       ('9','  1',48);
+	
+
+select * from score1;
\ No newline at end of file
diff --git "a/\346\226\260\345\273\272\346\226\207\344\273\266\345\244\271/SQLQuery1.sql" "b/\346\226\260\345\273\272\346\226\207\344\273\266\345\244\271/SQLQuery1.sql"
new file mode 100644
index 0000000000000000000000000000000000000000..80467118ff0f88e8b909f4208cef40eef42423d7
--- /dev/null
+++ "b/\346\226\260\345\273\272\346\226\207\344\273\266\345\244\271/SQLQuery1.sql"
@@ -0,0 +1,53 @@
+
+use sxh;
+create table stuinfo(
+studentid varchar(10) primary key,
+studentname nvarchar(10) not null,
+studentage tinyint ,
+studentaddress nvarchar(30),
+studentseat int identity,
+studentsex int
+);
+
+create table eaxm(
+examid int primary key identity,
+studentid varchar(10),
+writtenexam tinyint,
+labexam int
+);
+exec sp_rename 'eaxm','exam';
+
+select * from stuinfo;
+insert into stuinfo(studentid,studentname,studentage,studentaddress,studentsex)
+values ('s2501','张秋利',20,'美国硅谷',1)
+insert into stuinfo(studentid,studentname,studentage,studentaddress,studentsex)
+values ('s2502','李斯文',18,'湖北武汉',0)
+insert into stuinfo(studentid,studentname,studentage,studentaddress,studentsex)
+values ('s2503','马文才',22,'湖南长沙',1)
+insert into stuinfo(studentid,studentname,studentage,studentaddress,studentsex)
+values ('s2504','欧阳俊雄',21,'湖北武汉',0)
+insert into stuinfo(studentid,studentname,studentage,studentaddress,studentsex)
+values ('s2505','梅超风',20,'湖北武汉',1)
+insert into stuinfo(studentid,studentname,studentage,studentaddress,studentsex)
+values ('s2506','陈旋风',19,'美国硅谷',1)
+insert into stuinfo(studentid,studentname,studentage,studentaddress,studentsex)
+values ('s2507','陈风',20,'美国硅谷',0)
+
+select * from exam;
+insert into exam(studentid,writtenexam,labexam)
+values('s2501',50,70);
+insert into exam(studentid,writtenexam,labexam)
+values('s2502',60,65);
+insert into exam(studentid,writtenexam,labexam)
+values('s2503',86,85);
+insert into exam(studentid,writtenexam,labexam)
+values('s2504',40,80);
+insert into exam(studentid,writtenexam,labexam)
+values('s2505',70,90);
+insert into exam(studentid,writtenexam,labexam)
+values('s2506',85,90);
+
+select * from stuinfo;
+select studentid 学生学号,studentname 学生姓名,studentage 学生年龄,studentaddress 学生地址,studentseat 学生座位号,studentsex 学生性别 from stuinfo;
+select studentid,studentage,studentaddress from stuinfo;
+select studentid,written
diff --git "a/\346\226\260\345\273\272\346\226\207\344\273\266\345\244\271/where\345\255\220\345\217\245.sql" "b/\346\226\260\345\273\272\346\226\207\344\273\266\345\244\271/where\345\255\220\345\217\245.sql"
new file mode 100644
index 0000000000000000000000000000000000000000..a19dd11d546a68f5dabc22e7fc6c4d720a3c81bc
--- /dev/null
+++ "b/\346\226\260\345\273\272\346\226\207\344\273\266\345\244\271/where\345\255\220\345\217\245.sql"
@@ -0,0 +1,78 @@
+--查询
+--	select [top n percent] | [distinct]  列名,列名,.......
+--	from 表名,.....
+--  where 条件表达式
+
+
+
+--eg：查询所有的学生信息
+select * from StuInfo;
+
+--eg:查询前10条的学生数据
+select top 10 * from StuInfo;
+
+
+--eg:查询出哪些班级有学生信息
+select distinct classid from StuInfo;
+
+
+
+--列名之间可以进行运算
+select *,StuName+'@'+StuAddress as 邮箱 from StuInfo;
+
+
+
+
+--where 条件子句：对查询结果进行条件筛选，只有记录符合where条件表达式才返回到结果集中
+--	条件表达式：结果必须是布尔型，字段名和运算符
+--	运算符：
+--	1）比较运算符：>  >=  <  <=  <>  !=
+
+--eg：查询考试成绩不及格的成绩信息
+select * from Scores where score<60;
+
+
+--	2)逻辑运算符：and(与) 、 or(或者) 、not(非)
+--eg：查询课程编号为1并且成绩不及格的成绩信息
+select * from Scores where score<60 and CourseId=1;
+
+--eg：查询班级编号为1和2的学生信息
+select * from StuInfo where ClassId=1 or classId=2;
+
+--eg：查询班级编号不为1和2的学生信息
+select * from StuInfo where not(ClassId=1 or classId=2);
+
+
+--	3)范围运算符：between A  and B ：值在[A,B]范围内；not between A  and B ：值不在[A,B]范围内
+
+--eg:查询出生年份在2001的学生信息,2001-01-01  2001-12-31
+select * from StuInfo where StuBrithday>= '2001-01-01' and  StuBrithday<='2001-12-31';
+
+select * from StuInfo where StuBrithday between '2001-01-01' and '2001-12-31';
+
+select * from StuInfo where year(StuBrithday) =2001
+
+--eg:查询出生年份不在2001的学生信息
+select * from StuInfo where StuBrithday not between '2001-01-01' and '2001-12-31'
+
+--	4)列表运算符：in(值1,值2,....)   not in(值1,值2,....)
+--	eg:查询班级编号为1,2,3的学生信息
+select * from StuInfo where classid=1 or ClassId=2 or ClassId=3
+
+select * from StuInfo where ClassId in(1,2,3);
+
+--	eg:查询班级编号不为1,2,3的学生信息
+
+select * from StuInfo where ClassId not in(1,2,3);
+
+--	5)空值运算符：is null ,not is null
+--		NULL代表空值,代表该字段在插入数据时未赋值，并未分配内存地址空间
+--		''代表空字符串，有存储空间，但是没有字符
+--eg：查询地址为NULL的学生信息
+select * from StuInfo where StuAddress is null;
+
+--eg:查询地址信息为空（没有数据）的学生信息
+select * from StuInfo where StuAddress is null or StuAddress='';
+
+
+
diff --git "a/\346\226\260\345\273\272\346\226\207\344\273\266\345\244\271/\346\237\245\350\257\242\346\274\224\347\244\272\346\225\260\346\215\256\345\272\223.sql" "b/\346\226\260\345\273\272\346\226\207\344\273\266\345\244\271/\346\237\245\350\257\242\346\274\224\347\244\272\346\225\260\346\215\256\345\272\223.sql"
new file mode 100644
index 0000000000000000000000000000000000000000..da8f22ce4cdc9da9f28fe5642d719e161d4150f5
--- /dev/null
+++ "b/\346\226\260\345\273\272\346\226\207\344\273\266\345\244\271/\346\237\245\350\257\242\346\274\224\347\244\272\346\225\260\346\215\256\345\272\223.sql"
@@ -0,0 +1,194 @@
+--使用master数据库
+use master
+go
+
+--如果存在TestDB数据库删除数据库
+if exists(select * from sys.databases where name='TestDB')
+	drop database TestDB;
+go
+
+--创建数据库
+create database TestDB
+go
+--go批处理标志，分割sql文件；等待前面语句执行完毕再执行后面的sql语句
+
+--使用TestDB数据库
+use TestDB 
+go
+
+
+-----------------
+--建表部分
+-----------------
+
+--创建班级表
+create table ClassInfo
+(
+	ClassId int identity(1,1) primary key,  --主键，班级编号，标识列
+	ClassName nvarchar(20) not null			--班级名称，非空
+)
+go
+
+--创建学生信息表
+create table StuInfo
+(
+	StuId int identity(1,1) primary key,	--主键，学号，标识列
+	ClassId int references ClassInfo(ClassId) on delete set null, --所属班级编号，外键关联班级表的班级编号
+	StuName nvarchar(10) not null,		--姓名，非空
+	StuSex  nvarchar(1) default('男') check(StuSex in('男','女')),	--性别
+	StuBrithday date,	--出生日期
+	StuPhone nvarchar(11) check(len(StuPhone)=11) unique,--手机号，限制11位,唯一不重复
+	StuAddress nvarchar(200),--地址
+	CreateDate datetime default(getdate())	--创建时间，默认为系统时间
+)
+go
+
+--创建课程信息表
+create table CourseInfo
+(
+	CourseId int identity(1,1) primary key,	--课程编号，主键，标识列
+	CourseName nvarchar(50) unique not null ,--课程名称，非空，唯一不重复
+	CourseCredit int default(1) check(CourseCredit between 1 and 5) --学分，默认值为1，取值范围1-5
+)
+go
+
+--创建成绩表
+create table Scores
+(
+	ScoreId int identity(1,1) primary key,--成绩编号，主键，标识列
+	StuId int references StuInfo(StuId),--学号，外键关联学生信息表的学号
+	CourseId int references CourseInfo(CourseId),--课程编号，外键关联课程信息表的课程编号
+	Score int default(0)	--成绩,默认为0
+)
+go
+
+
+
+----------------
+--插入数据部分
+----------------
+--插入班级信息表
+insert into ClassInfo(ClassName)
+values('软件1班'),('软件2班'),('软件3班'),('软件4班'),('软件5班'),('软件6班'),('软件7班')
+go
+
+
+--插入学生信息
+insert into StuInfo(ClassId,StuName,StuSex,StuBrithday,StuPhone,StuAddress)
+values(1,'刘正','男','2002-08-02','13245678121','广西省桂林市七星区空明西路10号鸾东小区')
+insert into StuInfo(ClassId,StuName,StuSex,StuBrithday,StuPhone,StuAddress)
+values(1,'黄贵','男','2003-07-02','13345678121','江西省南昌市青山湖区艾溪湖南路南150米广阳小区')
+insert into StuInfo(ClassId,StuName,StuSex,StuBrithday,StuPhone,StuAddress)
+values(1,'陈美','女','2002-07-22','13355678125','福建省龙岩市新罗区曹溪街道万达小区')
+
+insert into StuInfo(ClassId,StuName,StuSex,StuBrithday,StuPhone,StuAddress)
+values(2,'江文','男','2001-07-02','13347678181','湖南省长沙市雨花区红花坡社区')
+insert into StuInfo(ClassId,StuName,StuSex,StuBrithday,StuPhone,StuAddress)
+values(2,'钟琪','女','2003-01-13','13345778129','安徽省合肥市庐阳区四里河路与潜山路交汇处万科城市之光')
+
+
+insert into StuInfo(ClassId,StuName,StuSex,StuBrithday,StuPhone,StuAddress)
+values(3,'曾小林','男','2003-05-15','13345378563','安徽省合肥市庐阳区四里河路与潜山路交汇处万科城市之光')
+insert into StuInfo(ClassId,StuName,StuSex,StuBrithday,StuPhone,StuAddress)
+values(3,'欧阳天天','女','2002-08-19','13347878121','湖北省武汉市洪山区友谊大道与二环线交汇处融侨悦府')
+insert into StuInfo(ClassId,StuName,StuSex,StuBrithday,StuPhone,StuAddress)
+values(3,'李逍遥','男','2003-09-02','13345678557','广东省广州市白云区金沙洲岛御洲三街恒大绿洲')
+
+
+insert into StuInfo(ClassId,StuName,StuSex,StuBrithday,StuPhone,StuAddress)
+values(4,'刘德华','男','2003-06-11','15345679557',null)
+insert into StuInfo(ClassId,StuName,StuSex,StuBrithday,StuPhone,StuAddress)
+values(4,'刘翔','男','2003-07-09','18346679589',null)
+insert into StuInfo(ClassId,StuName,StuSex,StuBrithday,StuPhone,StuAddress)
+values(4,'曾小贤','男','2003-07-02','18348979589',null)
+
+
+insert into StuInfo(ClassId,StuName,StuSex,StuBrithday,StuPhone,StuAddress)
+values(5,'刘','男','2002-07-02','18348979509',null)
+insert into StuInfo(ClassId,StuName,StuSex,StuBrithday,StuPhone,StuAddress)
+values(5,'陈天翔','男','2002-07-02','18348079509',null)
+insert into StuInfo(ClassId,StuName,StuSex,StuBrithday,StuPhone,StuAddress)
+values(5,'刘能','男','2002-08-02','13245678122','广西省桂林市七星区空明西路10号鸾东小区')
+insert into StuInfo(ClassId,StuName,StuSex,StuBrithday,StuPhone,StuAddress)
+values(5,'钟馗','男','2002-08-02','13245678123','广西省桂林市七星区空明西路10号鸾东小区')
+insert into StuInfo(ClassId,StuName,StuSex,StuBrithday,StuPhone,StuAddress)
+values(5,'钟吴艳','女','2002-08-02','13245678124','广西省桂林市七星区空明西路10号鸾东小区')
+
+insert into StuInfo(ClassId,StuName,StuSex,StuBrithday,StuPhone,StuAddress)
+values(5,'刘欢','男','2002-07-02','13245678125',null)
+insert into StuInfo(ClassId,StuName,StuSex,StuBrithday,StuPhone,StuAddress)
+values(5,'张庭','女','2002-07-02','13245678126',null)
+insert into StuInfo(ClassId,StuName,StuSex,StuBrithday,StuPhone,StuAddress)
+values(5,'曹植','男','2002-08-02','13245678127','')
+insert into StuInfo(ClassId,StuName,StuSex,StuBrithday,StuPhone,StuAddress)
+values(5,'曹操','男','2002-08-02','13245678128','')
+insert into StuInfo(ClassId,StuName,StuSex,StuBrithday,StuPhone,StuAddress)
+values(5,'孙尚香','女','2002-08-02','13245678129','')
+go
+
+
+
+--插入课程信息
+insert into CourseInfo(CourseName,CourseCredit) values('计算机基础',3)
+insert into CourseInfo(CourseName,CourseCredit) values('HTML+CSS网页制作',5)
+insert into CourseInfo(CourseName,CourseCredit) values('JAVA编程基础',5)
+insert into CourseInfo(CourseName,CourseCredit) values('SQL Server数据库基础',4)
+insert into CourseInfo(CourseName,CourseCredit) values('C#面向对象编程',5)
+insert into CourseInfo(CourseName,CourseCredit) values('Winform桌面应用程序设计',5)
+go
+
+--插入成绩信息
+insert into Scores (StuId, CourseId, Score) values (1, 1, 80); 
+insert into Scores (StuId, CourseId, Score) values (1, 2, 78);
+insert into Scores (StuId, CourseId, Score) values (1, 3, 65);
+insert into Scores (StuId, CourseId, Score) values (1, 4, 90);
+
+insert into Scores (StuId, CourseId, Score) values (2, 1, 60);
+insert into Scores (StuId, CourseId, Score) values (2, 2, 77);
+insert into Scores (StuId, CourseId, Score) values (2, 3, 68);
+insert into Scores (StuId, CourseId, Score) values (2, 4, 88);
+
+insert into Scores (StuId, CourseId, Score) values (3, 1, 88);
+insert into Scores (StuId, CourseId, Score) values (3, 2, 45);
+insert into Scores (StuId, CourseId, Score) values (3, 3, 66);
+insert into Scores (StuId, CourseId, Score) values (3, 4, 75);
+
+insert into Scores (StuId, CourseId, Score) values (4, 1, 56);
+insert into Scores (StuId, CourseId, Score) values (4, 2, 80);
+insert into Scores (StuId, CourseId, Score) values (4, 3, 75);
+insert into Scores (StuId, CourseId, Score) values (4, 4, 66);
+
+insert into Scores (StuId, CourseId, Score) values (5, 1, 88);
+insert into Scores (StuId, CourseId, Score) values (5, 2, 79);
+insert into Scores (StuId, CourseId, Score) values (5, 3, 72);
+insert into Scores (StuId, CourseId, Score) values (5, 4, 85);
+
+insert into Scores (StuId, CourseId, Score) values (6, 1, 68);
+insert into Scores (StuId, CourseId, Score) values (6, 2, 88);
+insert into Scores (StuId, CourseId, Score) values (6, 3, 73);
+insert into Scores (StuId, CourseId, Score) values (6, 5, 63);
+
+insert into Scores (StuId, CourseId, Score) values (7, 1, 84);
+insert into Scores (StuId, CourseId, Score) values (7, 2, 90);
+insert into Scores (StuId, CourseId, Score) values (7, 3, 92);
+insert into Scores (StuId, CourseId, Score) values (7, 5, 78);
+
+insert into Scores (StuId, CourseId, Score) values (8, 1, 58);
+insert into Scores (StuId, CourseId, Score) values (8, 2, 59);
+insert into Scores (StuId, CourseId, Score) values (8, 3, 65);
+insert into Scores (StuId, CourseId, Score) values (8, 5, 75);
+
+insert into Scores (StuId, CourseId, Score) values (9, 1, 48);
+insert into Scores (StuId, CourseId, Score) values (9, 2, 67);
+insert into Scores (StuId, CourseId, Score) values (9, 3, 71);
+insert into Scores (StuId, CourseId, Score) values (9, 5, 56);
+insert into Scores (StuId, CourseId, Score) values (9, 5, 56);
+go
+
+
+
+
+select * from ClassInfo;
+select * from StuInfo;
+select * from Scores;
+select * from CourseInfo;