有条件的WHERE条件SQL脚本

Question

我有一个要求，在进行求和时过滤一个特定的行。表结构和数据如下。

我想除了行WHERE [Reason] = 'Order Placed' AND [No Of Month Old] = 1之外的所有行的列值为[Gain/Lost]。

以下情况下的值将为-560。

Answer 1

你用英语描述你的条件不错 - 现在你只需要编写同样的事情在SQL：

SELECT SUM([Gain/Lost] 
FROM mytable 
WHERE NOT ([Reason] = 'Order Placed' AND [No Of Month Old] = 1) 

Answer 2

SELECT UserID, 
     SUM(CASE WHEN [Reason] = 'Order Placed' AND [No Of Month Old] = 1 
       THEN 0 
       ELSE [Gain/Lost] 
      END) 
FROM tt 
GROUP BY UserID 

Answer 3

select userid, sum([Gain/Lost]) 
from tablename 
where [Reason] <> 'Order Placed' 
    or [No Of Month Old] <> 1 
group by userid 

Answer 4

SELECT SUM([GAIN/LOST]) as 'Gain/Lost' 
FROM YourTable yt 
WHERE REASON <> 'Order Placed' AND [No of Month Old] <> 1 
GROUP BY UserID