有條件的WHERE條件SQL腳本

Question

我有一個要求，在進行求和時過濾一個特定的行。表結構和數據如下。

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

以下情況下的值將爲-560。

Answer 1

你用英語描述你的條件不錯 - 現在你只需要編寫同樣的事情在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