如何整合多個子查詢與總和和分組

Question

我需要顯示用戶信息和多個總和與他們自己的「指定用戶的交易餘額的」where和group by「限定符。 我需要顯示實際餘額，獎金餘額和總餘額。 用一筆款項很簡單，但我無法用多筆款項來完成。

這裏是我的查詢與「真正的平衡」：

SELECT v2_user.id, v2_user.username, v2_user.first_name, 
v2_user.last_name,  coalesce(SUM(v2_wallet.amount),0) AS 'Real balance' 
from v2_wallet 
join v2_user 
on v2_wallet.user_id = v2_user.id 
WHERE TYPE NOT LIKE '%BONUS%' 
group by v2_wallet.user_id 

我要2個列添加到我的查詢：

SELECT COALESCE(SUM(v2_wallet.amount),0) AS 'bonus balance' from 
v2_wallet   
WHERE TYPE LIKE '%BONUS%' group by user_id 

SELECT COALESCE(SUM(v2_wallet.amount),0) AS 'total balance' from v2_wallet group by user_id 

Answer 1

嵌入的總和，而不是在WHERE子句中的條件，依靠布爾值評估爲0或1的事實。

SELECT v2_user.id, v2_user.username, v2_user.first_name, v2_user.last_name,   
SUM(v2_wallet.amount*(TYPE not like '%BONUS%')) AS 'Real balance', 
SUM(v2_wallet.amount*(TYPE like '%BONUS%')) AS 'Bonus balance', 
SUM(v2_wallet.amount) AS 'Total balance' 
from v2_wallet 
join v2_user 
on v2_wallet.user_id = v2_user.id 
group by v2_wallet.user_id 

如果v2_wallet.amount可能爲NULL，你需要使用上面的COALESCE（v2_wallet.amount，0）。

如果你不喜歡的是，看起來，你可以使用。如果不乘，像

SELECT v2_user.id, v2_user.username, v2_user.first_name, v2_user.last_name,   
SUM(IF(TYPE not like '%BONUS%',v2_wallet.amount*,0)) AS 'Real balance', 
SUM(IF(TYPE like '%BONUS%', v2_wallet.amount, 0)) AS 'Bonus balance', 
SUM(v2_wallet.amount) AS 'Total balance' 
from v2_wallet 
join v2_user 
on v2_wallet.user_id = v2_user.id 
group by v2_wallet.user_id 

Answer 2

我還沒有在一段時間做的MySQL。但通常這個代碼應該。這是用SQL服務器sql語法進行測試的。

SELECT U.UserID,U.FirstName,T.TOTAL,B.BONUS 
FROM Users U 
LEFT JOIN (SELECT USERID, COALESCE (SUM(AMOUNT),0) AS TOTAL 
      FROM WALLET 
      GROUP BY USERID) AS T ON U.UserID=T.UserId 
LEFT JOIN (SELECT USERID, COALESCE (SUM(AMOUNT),0) AS BONUS 
      FROM WALLET 
      WHERE TYPE='BONUS' 
      GROUP BY USERID) AS B ON U.USERID=B.USERID