基於另一個表在表中插入值

Question

我需要編寫一個存儲過程。 我有一個表的一些數據現在我需要根據一些條件相關數據插入到另一個表

實施例：

Table 1 

Name  Class Math Physics English 
Alok  V  60 50  45 
Bobby V  78 87  86 
Chandini VI 56 76  56 
Dolly VII 87 56  66 

基於此條件

Insert Values into Table2 
If class =V 
(Table2.Physics=Select sum(Table1.Physics) from Table1 where Class like ‘V’ 
Table2.Maths=0 and table2.English=0) 

If class =VI 
(Table2.Maths=Select sum(Table1.Maths) from Table1 where Class like ‘VI’ 
Table2.Physics=0 and table2.English=0) 

If class =VI 
(Table2.English =Select sum(Table1.English) from Table1 where Class like ‘VII’ 
Table2.Physics=0 and table2.Maths =0) 
] 

 

Table 2 

Class Math Physics English 
V  0 137  0 
VI 56 0  0 
VII 0 0  66 

請幫我解決

Answer 1

INSERT 
INTO table2 
SELECT class, 
     SUM(CASE WHEN class = 'V' THEN Physics ELSE 0 END), 
     SUM(CASE WHEN class = 'VI' THEN Math ELSE 0 END), 
     SUM(CASE WHEN class = 'VII' THEN English ELSE 0 END) 
FROM table1 
GROUP BY 
     class 

Answer 2

您是否必須使用存儲過程或甚至另一個表？

A 查看服務器更好，因爲它永遠不會與真實數據同步。 （也沒有真正的性能問題。）

CREATE VIEW table2 AS 
SELECT class, 
     SUM(CASE WHEN table1.class = 'V' THEN table1.physics ELSE 0 END), 
     SUM(CASE WHEN table1.class = 'VI' THEN table1.math ELSE 0 END), 
     SUM(CASE WHEN table1.class = 'VII' THEN table1.english ELSE 0 END) 
FROM table1 
GROUP BY class