diff --git "a/40\345\274\240\350\200\200\344\273\201/\344\275\234\344\270\232/0919\344\275\234\344\270\232.sql" "b/40\345\274\240\350\200\200\344\273\201/\344\275\234\344\270\232/0919\344\275\234\344\270\232.sql"
new file mode 100644
index 0000000000000000000000000000000000000000..30424bbf9d9e6c1f009ba54cb09b577cc12543e0
--- /dev/null
+++ "b/40\345\274\240\350\200\200\344\273\201/\344\275\234\344\270\232/0919\344\275\234\344\270\232.sql"
@@ -0,0 +1,32 @@
+----------------作业---------------------
+--1. 关羽的银行卡号为"6225547858741263"，查询出余额比关羽多的银行卡信息，显示卡号，身份证，姓名，余额。
+select * from BankCard b
+inner join AccountInfo a on b.AccountId=a.AccountId
+where CardMoney >(select CardMoney from BankCard where CardNo='6225547858741263');
+--2. 从所有账户信息中查询出余额最高的交易明细(存钱取钱信息)。
+select * from BankCard b
+INNER join CardExchange c on b.CardNo = c.CardNo
+where CardMoney IN  (select max(CardMoney) from BankCard )
+--3. 查询有取款记录的银行卡及账户信息，显示卡号，身份证，姓名，余额。
+select a.RealName,a.AccountCode,b.CardNo,b.CardMoney from AccountInfo a
+INNER JOIN dbo.BankCard b ON b.AccountId = a.AccountId
+WHERE b.CardNo IN (select CardNoOut from CardTransfer)
+--4. 查询出没有存款记录的银行卡及账户信息，显示卡号，身份证，姓名，余额。
+select a.RealName,a.AccountCode,b.CardNo,b.CardMoney from AccountInfo a
+INNER JOIN dbo.BankCard b ON b.AccountId = a.AccountId
+WHERE b.CardMoney IN (select MoneyInBank from CardExchange)
+--5. 关羽的银行卡号为"6225547858741263",查询当天是否有收到转账。
+ if exists( select * from CardTransfer where CardNoIn=6225547858741263)
+	print '有'
+  else
+	print '没有'
+--6. 查询出交易次数（存款取款操作）最多的银行卡账户信息，显示：卡号，身份证，姓名，余额，交易次数。
+select AccountInfo.*,BankCard.CardMoney from AccountInfo
+inner join BankCard on BankCard.AccountId=AccountInfo.AccountId
+where BankCard.AccountId in(
+select AccountId from BankCard
+where CardNo in (select CardNoOut from CardTransfer))
+--7. 查询出没有转账交易记录的银行卡账户信息，显示卡号，身份证，姓名，余额。
+select a.RealName,a.AccountCode,b.CardNo,b.CardMoney from AccountInfo a
+INNER JOIN dbo.BankCard b ON b.AccountId = a.AccountId
+WHERE b.CardNo != ( SELECT CardNoIn FROM CardTransfer ) AND b.CardNo !=( SELECT CardNoOut FROM CardTransfer )
\ No newline at end of file
diff --git "a/40\345\274\240\350\200\200\344\273\201/\344\275\234\344\270\232/0921\344\275\234\344\270\232.sql" "b/40\345\274\240\350\200\200\344\273\201/\344\275\234\344\270\232/0921\344\275\234\344\270\232.sql"
new file mode 100644
index 0000000000000000000000000000000000000000..24308ef954d423d0f7ee43489212031d3e72ae32
--- /dev/null
+++ "b/40\345\274\240\350\200\200\344\273\201/\344\275\234\344\270\232/0921\344\275\234\344\270\232.sql"
@@ -0,0 +1,51 @@
+--13. 按平均成绩从高到低显示所有学生的所有课程的成绩以及平均成绩
+select sid, 
+	max(case when cid ='01'then score else null end)语文,
+	max(case when cid ='02'then score else null end)数学,
+	max(case when cid ='03'then score else null end)英语,
+	AVG(score)平均成绩
+	from sc
+	group by sid
+	order by avg (score) desc
+
+--14. 查询各科成绩最高分、最低分和平均分：
+
+--以如下形式显示：课程 ID，课程 name，最高分，最低分，平均分，及格率，中等率，优良率，优秀率
+
+--及格为>=60，中等为：70-80，优良为：80-90，优秀为：>=90
+
+--要求输出课程号和选修人数，查询结果按人数降序排列，若人数相同，按课程号升序排列
+SELECT 
+cid AS 课程ID,
+COUNT(sid) AS 课程人数,
+MAX(score) AS 最高分,
+MIN(score) AS 最低分,
+AVG(score) AS 平均分,
+SUM(及格) / COUNT(sid) AS 及格率,
+SUM(中等) / COUNT(sid) AS 中等率,
+SUM(优良) / COUNT(sid) AS 优良率,
+SUM(优秀) / COUNT(sid) AS 优秀率 
+FROM
+(SELECT *,
+CASE WHEN score >= 60 THEN 1 ELSE 0 END AS 及格,
+CASE WHEN score >= 70 AND score<80 THEN 1  ELSE 0 END AS 中等, 
+CASE WHEN score >= 80 AND score<90 THEN 1  ELSE 0 END AS 优良,
+CASE WHEN score >= 90 THEN 1 ELSE 0 END AS 优秀
+FROM sc) a 
+GROUP BY cid 
+ORDER BY COUNT(sid) DESC,cid
+
+select 
+(select count(*) from sc s2 where s1.CId = s2.CId and s2.score>60 group by cid) s,count(*)
+from sc s1
+group by s1.cid
+
+--15. 按各科成绩进行排序，并显示排名， Score 重复时保留名次空缺
+select rank() over (partition by cid order by score desc) as 排名,cid,score from SC;
+
+--15.1 按各科成绩进行排序，并显示排名， Score 重复时合并名次
+select DENSE_RANK() over (partition by cid order by score desc) as 排名,cid,score from SC;
+--16. 查询学生的总成绩，并进行排名，总分重复时保留名次空缺
+select rank() over (order by sum(score) desc) as 排名,sid,sum(score) from SC group by sid 
+--16.1 查询学生的总成绩，并进行排名，总分重复时不保留名次空缺
+select DENSE_RANK() over (order by sum(score) desc) as 排名,sid,sum(score) from SC group by sid 
\ No newline at end of file
diff --git "a/40\345\274\240\350\200\200\344\273\201/\347\254\224\350\256\260/0919\345\255\220\346\237\245\350\257\242\346\225\260\346\215\256\350\241\250.sql" "b/40\345\274\240\350\200\200\344\273\201/\347\254\224\350\256\260/0919\345\255\220\346\237\245\350\257\242\346\225\260\346\215\256\350\241\250.sql"
new file mode 100644
index 0000000000000000000000000000000000000000..254830b7baff493af99916df426c10f448909785
--- /dev/null
+++ "b/40\345\274\240\350\200\200\344\273\201/\347\254\224\350\256\260/0919\345\255\220\346\237\245\350\257\242\346\225\260\346\215\256\350\241\250.sql"
@@ -0,0 +1,67 @@
+--drop database DBSTUDENT
+create database DBSTUDENTS
+go
+use DBSTUDENTS
+go
+
+create table StuInfo(
+	StuID int primary key identity(1,1),
+	StuName varchar(20),
+	StuSex varchar(2),
+	ClassID int
+);
+go
+
+create table StuScore(
+	ExamNo int primary key identity(1,1),
+	StuID int,
+	Subject varchar(20),
+	Score int
+);
+go
+
+
+create table StuCourse(
+	cid int primary key,
+	cname varchar(20)
+);
+
+
+create table teacher(
+	tid int,
+	tname varchar(20) unique
+);
+
+
+--
+insert StuInfo values('黄炜杰','男',1);
+insert StuInfo values('周飘','女',2);
+insert StuInfo values('曾鹏','男',1);
+insert StuInfo values('李雅芸','女',1);
+insert StuInfo values('达兴建','男',2);
+go
+
+--
+insert StuScore values(1,'HTML',85);
+insert StuScore values(1,'Java',80);
+insert StuScore values(1,'SQL',82);
+insert StuScore values(2,'HTML',70);
+insert StuScore values(2,'Java',81);
+insert StuScore values(2,'SQL',60);
+insert StuScore values(3,'HTML',70);
+insert StuScore values(3,'Java',90);
+insert StuScore values(3,'SQL',85);
+insert StuScore values(4,'Java',61);
+insert StuScore values(4,'SQL',68);
+insert StuScore values(5,'HTML',90);
+insert StuScore values(5,'Java',81);
+insert StuScore values(5,'SQL',65);
+go
+
+select * from StuInfo;
+select * from StuScore;
+go
+
+
+
+
diff --git "a/40\345\274\240\350\200\200\344\273\201/\347\254\224\350\256\260/20220921-4\347\217\255-\345\205\263\350\201\224\345\255\220\346\237\245\350\257\242_\346\216\222\345\272\217.sql" "b/40\345\274\240\350\200\200\344\273\201/\347\254\224\350\256\260/20220921-4\347\217\255-\345\205\263\350\201\224\345\255\220\346\237\245\350\257\242_\346\216\222\345\272\217.sql"
new file mode 100644
index 0000000000000000000000000000000000000000..866f10e5ab4076e1904283c7b65161bc22ce2a20
--- /dev/null
+++ "b/40\345\274\240\350\200\200\344\273\201/\347\254\224\350\256\260/20220921-4\347\217\255-\345\205\263\350\201\224\345\255\220\346\237\245\350\257\242_\346\216\222\345\272\217.sql"
@@ -0,0 +1,29 @@
+use STUDENTS
+go
+
+select * from tb_student
+
+--查询年龄最大的学生信息，要求显示：姓名，性别，年龄
+select birth,name 姓名,gender 性别 from tb_student 
+where birth = (select min(birth) from tb_student)
+
+--排序函数
+select birth,姓名,性别  from (
+select birth,name 姓名,gender 性别,row_number() over (order by birth ) as birth_rank from tb_student
+) as T1
+where T1.birth_rank = 1
+
+--查询男生和女生中年龄最大的学生信息，要求显示：姓名，性别，年龄
+--非关联子查询
+select birth,name 姓名,gender 性别 from tb_student 
+where birth in (select min(birth) from tb_student group by gender)
+
+--关联子查询：内部查询需要引用外部表已查询出的信息
+select birth,name 姓名,gender 性别 from tb_student t1
+where birth = (select min(birth) from tb_student t2 where t2.gender=t1.gender)
+
+--窗口函数：排序
+select birth,姓名,性别  from (
+select birth,name 姓名,gender 性别,row_number() over (partition by gender order by birth ) as birth_rank from tb_student
+) as T1
+where T1.birth_rank = 1