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+# 1.卡题记录
+
+```sql
+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 student where stuName like '__俊%';
+
+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
+select * from student left
+join class c on student.stuNO = c.stuNO
+where c.writtenExam != any(select writtenExam from
+class where writtenExam between 70 and
+90) order by writtenExam ;
+```
+
+# 2.作业
+
+```sql
+create database studentclass charset utf8;
+use studentclass;
+create table student(
+    stuNO varchar(5),
+    stuName varchar(10),
+    stuAge int,
+    stuAddress varchar(4) ,
+    stuSeat int ,
+    stuSex varchar(2)
+);
+insert into student values
+('s2501','张秋利',20,'美国硅谷',1,1),
+ ('s2502','李斯文',20,'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);
+create table class(
+    examNO int,
+    stuNO varchar(5),
+    writtenExam int,
+    labExam int
+);
+insert into class values (1,'s2501',50,70),(2,'s2502',60,65),
+(3,'s2503',86,85),(4,'s2504',40,80),(5,'s2505',70,90),
+(6,'s2506',85,90);
+
+-- 按图片所给的数据进行数据表的建立和数据插入，然后进行以下查询操作
+
+1.查询学生信息表（stuinfo）中所有列信息，给每列取上中文名称
+select stuNO 学生学号, stuName 学生姓名, atuAge 学生年龄 ,stuAddress 地址, stuSeat 位置, stuSex 学生性别 from student;
+2.查询学生信息表（stuinfo）中的姓名，年龄和地址三列的信息
+select stuName 学生姓名,atuAge 学生年龄,stuAddress 地址 from student;
+3.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 student.stuNO 学生学号,writtenExam 笔试,labExam 机试 from student inner join class c on student.stuNO = c.stuNO;
+5.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 s.stuNO 学生学号,writtenExam 笔试,labExam 机试,sum(writtenExam+class.labExam) 总分
+from class inner join student s on class.stuNO = s.stuNO
+group by s.stuNO;
+6.查询学生信息表（stuInfo）中学生来自哪几个地方
+select stuAddress from student group by stuAddress;
+7.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 stuAge 学生年龄 from student group by stuAge;
+8.查询学生信息表（stuInfo）中前3行记录
+select * from student limit 3;
+9.查询学生信息表（stuInfo）中前4个学生的姓名和座位号
+select stuName 学生姓名,stuSeat 座位号 from student limit 4;
+11.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 student where stuAddress= '湖北武汉' and stuAge =20;
+12.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
+select *from student
+left join class c
+on student.stuNO = c.stuNO
+where labExam between 60 and 80 order by labExam desc ;
+13.查询来自湖北武汉或者湖南长沙的学生的所有信息
+select * from student where stuAddress ='湖北武汉'
+or'湖南长沙';
+14.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
+select * from student left
+join class c on student.stuNO = c.stuNO
+where c.writtenExam != any(select writtenExam from
+class where writtenExam between 70 and
+90) order by writtenExam ;
+15.查询年龄没有写的学生所有信息
+select* from student where stuAge is null ;
+16.查询年龄写了的学生所有信息
+select* from student where stuAge is not null;
+17.查询姓张的学生信息
+select *from student where stuName like '张%';
+18.查询学生地址中有‘湖’字的信息
+select * from student where stuAddress like '%湖%';
+19.查询姓张但名为一个字的学生信息
+select * from student where stuName like '张_';
+20.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 student where stuName like '__俊%';
+21.按学生的年龄降序显示所有学生信息
+select * from student order by stuAge desc ;
+22.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 student order by stuAge,stuSeat;
+23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 examNO 考试号,stuNO 学号,writtenExam 笔试成绩,
+       labExam 机试成绩 from class
+where writtenExam =(select max(writtenExam)from class);
+24.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 examNO 考试号,stuNO 学号,writtenExam 笔试成绩,
+       labExam 机试成绩 from class
+where writtenExam =(select min(writtenExam)from class);
+25.查询每个地方的学生的平均年龄
+select stuAddress,avg(stuAge)from student group by stuAddress;
+26.查询男女生的分别的年龄总和
+select stuSex,sum(stuAge) from student group by stuSex;
+27.查询每个地方的男女生的平均年龄和年龄的总和
+select avg(stuAge),sum(stuAge) from student group by stuSex;
+
+
+
+
+
+
+
+
+
+
+
+
+```
+