SQL語句，從一個表

Question

，我需要選擇

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

而且還

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

選擇兩種不同的價值大家好，我需要在我的表bid選擇兩種類型的地位和施展id我該怎麼做？

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，如果你想Concat的所有行，第一個成功，然後不成功，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 

編輯：「和如果想知道每個月有多少成功和多少成功？「

那麼這應該工作：

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