Sql查询减法 [英] Sql query for substraction

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问题描述

我在一个表TRANS中有两列source_id和Qty 

Source_id数量
2002 100
2002 200
2002 500
2002 -500

i想要获取 source_id的余额 100 + 200 = 300 因为(-500 + 500 = 0
如何编写查询 for this
我可以显示 100 200 saparate 两行 as balance





我的尝试:



i有两个列苏rce_id和Qty在一个表TRANS中。



来源_数量

2002 100

2002 200

2002 500

2002 -500



i想要获得此source_id的余额,即100 + 200 = 300,因为(-500 + 500 = 0)

如何为此

写一个查询,我可以在两行中显示100和200 saparate作为余额

解决方案

< blockquote>你应该使用 SQL GROUP BY语句



  SELECT  [Source_id],SUM([Qty]) FROM  [YourTableName] 
GROUP BY ([Source_id])





我可以在两行中显示100和200 saparate作为余额



我无法明白这一点。


i have two columns source_id and Qty in one table TRANS. 

Source_id   Qty
2002        100
2002        200 
2002        500
2002       -500

i want to get balance of this source_id which is 100+200=300 because (-500+500=0)
how can i write a query for this 
and can i show 100 and 200 saparate in two lines as balance



What I have tried:

i have two columns source_id and Qty in one table TRANS.

Source_id Qty
2002 100
2002 200
2002 500
2002 -500

i want to get balance of this source_id which is 100+200=300 because (-500+500=0)
how can i write a query for this
and can i show 100 and 200 saparate in two lines as balance

解决方案

You should use SQL GROUP BY Statement.

SELECT [Source_id], SUM([Qty]) FROM [YourTableName]
GROUP BY([Source_id])



"and can i show 100 and 200 saparate in two lines as balance"

I am unable to understand that.


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