Question

我需要选择

Select Bid Id,date
From Bid where
Status ='Won' as successful

还

Select Bid Id, date
From Bid where 
Status =Null as unsuccessful

大家好我需要在我的表bid中为状态选择两种类型，并显示id我该怎么做？

Answer 1

您可以使用CASE：

Select Bid, Id,date, 
   WonStatus = CASE WHEN Status ='Won' THEN 'Successful' ELSE 'Unsuccessful' END
From Bid where

或者，如果要连接所有行，首先是成功的，然后是不成功的，请使用UNION ALL：

Select Bid, Id,date
From Bid 
Where Status ='Won' as successful


UNION ALL

Select Bid, Id,date
From Bid 
Where Status IS NULL AS unsuccessful

修改：“如果想知道每月成功多少以及每月成功多少？”

然后这应该有效：

Select YEAR(date) AS B_Year,
       MONTH(date) AS B_Month,
       Count(*) AS Success_Count
From Bid 
Where Status = 'Won' 
GROUP BY YEAR(date), MONTH(date)

Answer 2

SELECT Bid
     , ID
     , date
     , CASE
         WHEN status IS NULL THEN 'unsuccessful'
         WHEN status = 'Won' THEN 'successful'
WHERE  status = 'Won'
    OR status IS NULL

Sql，从一个表中选择两个不同的值

2 个答案: