SQL不同行的总和

Question

我需要一些帮助来查询SUM不同的材料。

材料名称数量日期
A ...................... 20 .... 1/1/2010
A ...................... 10 .... 1/2/2010
B ...................... 30 .... 1/2/2010
C ...................... 20 .... 1/3/2010

例如我只想总结材料A和B.

Answer 1

SELECT SUM(Quantity) FROM TABLE WHERE MaterialName in ('A', 'B')

OR

SELECT MaterialName , SUM(Quantity) FROM TABLE 
WHERE MaterialName in ('A', 'B') GROUP BY MaterialName 

Answer 2

A，B的计数

select sum(case when MaterialName='A' then 1 else 0 end) as CountA,
sum(case when MaterialName='B' then 1 else 0 end) as CountB,
GROUP BY Date

如果您的意思是数量总和

SELECT SUM(Quantity),MaterialName  FROM TABLE WHERE MaterialName in ('A', 'B')
GROUP BY MaterialName 

Answer 3

试试这个。添加where clause以过滤A＆amp; B然后SUM每MaterialName

的数量

SELECT MaterialName,
       Sum(Quantity) Sum_Quantity
FROM   TableName
WHERE  MaterialName IN ( 'A', 'B' )
GROUP  BY MaterialName