diff --git "a/39\351\231\206\345\273\272\351\224\213/2022-09-22\347\254\254\345\233\233\346\254\241\344\275\234\344\270\232/2022-9-22\344\275\234\344\270\232.sql" "b/39\351\231\206\345\273\272\351\224\213/2022-09-22\347\254\254\345\233\233\346\254\241\344\275\234\344\270\232/2022-9-22\344\275\234\344\270\232.sql"
new file mode 100644
index 0000000000000000000000000000000000000000..6d49b531592405a42da471f492a664988db22a55
--- /dev/null
+++ "b/39\351\231\206\345\273\272\351\224\213/2022-09-22\347\254\254\345\233\233\346\254\241\344\275\234\344\270\232/2022-9-22\344\275\234\344\270\232.sql"
@@ -0,0 +1,46 @@
+use TEST04;
+select * from Student;
+select * from Course;
+select * from Teacher;
+select * from SC;
+--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 st.SId,st.Sname 名字,sc1.score 语文,sc2.score 数学,sc3.score 英语,平均成绩 from Student St
+left join SC sc1 on st.SId=SC1.SId and SC1.CId='01'
+left join SC sc2 on st.SId=SC2.SId and SC2.CId='02'
+left join SC sc3 on st.SId=SC3.SId and SC3.CId='03'
+left join (
+select st.SId,AVG(score) 平均成绩 from Student st
+left join SC on st.SId=sc.SId 
+group by st.sid
+)a
+on st.SId=a.SId
+order by 平均成绩 desc
+
+
+select a1.*,avg1  from sc a1 left join
+(select sid,avg(score) as avg1 from sc group by sid
+)b on a1.SId=b.sid
+ order by avg1 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 co.cid AS 课程id ,co.Cname AS 课程,MAX(sc.score) AS 最高分, MIN(sc.score)AS 最低分 ,AVG(sc.score) AS 平均分 ,
+     SUM(CASE WHEN sc.score >= 60 THEN 1 ELSE 0 END)/COUNT(sc.[SId]) AS 及格率,
+     SUM(CASE WHEN sc.score >= 70 AND sc.score< 80 THEN 1 ELSE 0 END)/COUNT(sc.[SId]) AS 中等率,
+     SUM(CASE WHEN sc.score >= 80 AND sc.score<90 THEN 1 ELSE 0 END)/COUNT(sc.[SId]) AS 优良率,
+     SUM(CASE WHEN sc.score >= 90 THEN 1 ELSE 0 END)/COUNT(sc.[SId]) AS 优秀率
+FROM Course co
+inner join SC on co.CId=sc.CId
+group by  co.cid ,co.Cname
+
+--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) rank  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) rank 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 sid,sum(score),rank() over(partition by sid order by sum(score) desc) rank 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 sid,sum(score),ROW_NUMBER() over(partition by sid order by sum(score)desc) rank from sc
+group by sid
\ No newline at end of file
diff --git "a/39\351\231\206\345\273\272\351\224\213/2022-09-22\347\254\254\345\233\233\346\254\241\344\275\234\344\270\232/2022-9-22\347\254\224\350\256\260.txt" "b/39\351\231\206\345\273\272\351\224\213/2022-09-22\347\254\254\345\233\233\346\254\241\344\275\234\344\270\232/2022-9-22\347\254\224\350\256\260.txt"
new file mode 100644
index 0000000000000000000000000000000000000000..bee2db0497107e2289f848dd7a16633e7f6744f4
--- /dev/null
+++ "b/39\351\231\206\345\273\272\351\224\213/2022-09-22\347\254\254\345\233\233\346\254\241\344\275\234\344\270\232/2022-9-22\347\254\224\350\256\260.txt"
@@ -0,0 +1,15 @@
+row_number 涓嶈烦璺冨紡鎺掑簭
+80 	1
+78	2
+78	3
+60	4
+rank 璺宠穬寮忔帓搴�
+80 	1
+78	2
+78	2
+60	4
+danse_rank 杩炵画寮忔帓搴�
+80	1
+78 	2
+78	2
+60	3
\ No newline at end of file