From b072814ef1d45a02badeb0e4ec937d2e6bd575dd Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E8=B0=A2=E9=87=91=E9=87=91?= <1665966989@qq.com>
Date: Thu, 22 Sep 2022 04:43:16 +0000
Subject: [PATCH] =?UTF-8?q?=E8=B0=A2=E9=87=91=E9=87=914?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Signed-off-by: 谢金金 <1665966989@qq.com>
---
 .../SQLQuery1.sql"                            | 39 +++++++++++++++++++
 ...4\345\255\220\346\237\245\350\257\242.txt" | 18 +++++++++
 2 files changed, 57 insertions(+)
 create mode 100644 "\350\260\242\351\207\221\351\207\221/\350\260\242\351\207\221\351\207\221\347\254\254\345\233\233\346\254\241\347\254\224\350\256\260\344\275\234\344\270\232/SQLQuery1.sql"
 create mode 100644 "\350\260\242\351\207\221\351\207\221/\350\260\242\351\207\221\351\207\221\347\254\254\345\233\233\346\254\241\347\254\224\350\256\260\344\275\234\344\270\232/\346\216\222\345\272\217\357\274\214\345\205\263\350\201\224\345\255\220\346\237\245\350\257\242.txt"

diff --git "a/\350\260\242\351\207\221\351\207\221/\350\260\242\351\207\221\351\207\221\347\254\254\345\233\233\346\254\241\347\254\224\350\256\260\344\275\234\344\270\232/SQLQuery1.sql" "b/\350\260\242\351\207\221\351\207\221/\350\260\242\351\207\221\351\207\221\347\254\254\345\233\233\346\254\241\347\254\224\350\256\260\344\275\234\344\270\232/SQLQuery1.sql"
new file mode 100644
index 0000000..39e1a01
--- /dev/null
+++ "b/\350\260\242\351\207\221\351\207\221/\350\260\242\351\207\221\351\207\221\347\254\254\345\233\233\346\254\241\347\254\224\350\256\260\344\275\234\344\270\232/SQLQuery1.sql"
@@ -0,0 +1,39 @@
+--13. ��ƽ���ɼ��Ӹߵ�����ʾ����ѧ�������пγ̵ijɼ��Լ�ƽ���ɼ�
+select sc1.SId,
+(select score from sc where cid='01' and sc.SId=sc1.sid) ����,
+(select score from sc where cid='02' and sc.SId=sc1.sid) ��ѧ,
+(select score from sc where cid='03' and sc.SId=sc1.sid) Ӣ��,
+AVG(score) ƽ���ɼ� from sc sc1
+group by sid
+order by AVG(score)desc
+--Ҫ������γ̺ź�ѡ����������ѯ����������������У���������ͬ�����γ̺���������
+select sc.CId,c.Cname,
+(select MAX(score) from sc group by cid having c.CId=sc.CId) ��߷�,
+(select MIN(score) from sc group by cid having c.CId=sc.CId) ��ͷ�,
+(select AVG(score) from sc group by cid having c.CId=sc.CId) ƽ����,
+((round(cast((sum(case when score >=60  then 1 else 0 end )) as float)/CAST(count(sc.cid) as float),2))*100) ������,
+((round(cast((sum(case when score >=70 and score<=80  then 1 else 0 end )) as float)/CAST(count(sc.cid) as float),2))*100) ���,
+((round(cast((sum(case when score >=80 and score<=90  then 1 else 0 end )) as float)/CAST(count(sc.cid) as float),2))*100) ������,
+((round(cast((sum(case when score >=90 then 1 else 0 end )) as float)/CAST(count(sc.cid) as float),2))*100) ������
+from Course c
+inner join sc on sc.CId=c.CId
+group by sc.CId,c.Cname,c.cid
+
+--15. �����Ƴɼ��������򣬲���ʾ������ Score �ظ�ʱ�������ο�ȱ
+select *,RANK() over (partition by cid order by score desc) rank from sc 
+--15.1 �����Ƴɼ��������򣬲���ʾ������ Score �ظ�ʱ�ϲ�����
+select *,DENSE_RANK() over (partition by cid order by score desc) rank from sc 
+--16. ��ѯѧ�����ܳɼ����������������ܷ��ظ�ʱ�������ο�ȱ
+select s1.SId,(select Sname from Student where Student.sid=s1.SId) ����,
+(select score from sc where cid='01' and sc.SId=sc1.sid) ����,
+(select score from sc where cid='02' and sc.SId=sc1.sid) ��ѧ,
+(select score from sc where cid='03' and sc.SId=sc1.sid) Ӣ��,
+sum(score) �ܳɼ�, RANK() over (order by sum(score) desc) rank from sc sc1
+group by sid
+--16.1 ��ѯѧ�����ܳɼ����������������ܷ��ظ�ʱ���������ο�ȱ
+select sc1.SId,(select Sname from Student where Student.sid=sc1.SId) ����,
+(select score from sc where cid='01' and sc.SId=sc1.sid) ����,
+(select score from sc where cid='02' and sc.SId=sc1.sid) ��ѧ,
+(select score from sc where cid='03' and sc.SId=sc1.sid) Ӣ��,
+sum(score) �ܳɼ�, DENSE_RANK() over (order by sum(score) desc) rank from sc sc1
+group by sid
\ No newline at end of file
diff --git "a/\350\260\242\351\207\221\351\207\221/\350\260\242\351\207\221\351\207\221\347\254\254\345\233\233\346\254\241\347\254\224\350\256\260\344\275\234\344\270\232/\346\216\222\345\272\217\357\274\214\345\205\263\350\201\224\345\255\220\346\237\245\350\257\242.txt" "b/\350\260\242\351\207\221\351\207\221/\350\260\242\351\207\221\351\207\221\347\254\254\345\233\233\346\254\241\347\254\224\350\256\260\344\275\234\344\270\232/\346\216\222\345\272\217\357\274\214\345\205\263\350\201\224\345\255\220\346\237\245\350\257\242.txt"
new file mode 100644
index 0000000..63b077e
--- /dev/null
+++ "b/\350\260\242\351\207\221\351\207\221/\350\260\242\351\207\221\351\207\221\347\254\254\345\233\233\346\254\241\347\254\224\350\256\260\344\275\234\344\270\232/\346\216\222\345\272\217\357\274\214\345\205\263\350\201\224\345\255\220\346\237\245\350\257\242.txt"
@@ -0,0 +1,18 @@
+保留空缺
+RANK() over (partition by ** order by  ** desc) rank 
+不保留空缺
+DENSE_RANK() over (partition by ** order by ** desc) rank
+关联子查询
+-- 所有从来没有下过单的客户的信息
+select c_custkey
+from
+  customer
+where
+  not exists (
+    select
+      *
+    from
+      orders
+    where
+      o_custkey = c_custkey
+  )
\ No newline at end of file
-- 
Gitee