MySQL - 希望減去兩個SELECT語句中的兩個SUM（）值

Question

我希望能夠從兩個SELECT查詢中獲取在SUM（）中生成的兩個值，並減去這些值以獲得結果（ OutstandingFunds）。

這是我的兩個SELECT查詢：

聲明（1）：

SELECT SUM(Cf.Amount) AS ClearedFunds 
FROM (
SELECT Amount FROM PAYMENT1 WHERE `Status` = "Cleared" 
UNION ALL 
SELECT Amount FROM PAYMENT2 WHERE `Status` = "Cleared" 
UNION ALL 
SELECT Amount FROM PAYMENT3 WHERE `Status` = "Cleared") AS Cf; 

聲明（2）：

SELECT SUM(Price) AS TotalSales 
FROM PROPERTY 
WHERE Status = 「Sold」; 

謝謝您的時間

Answer 1

如果您不需要單獨顯示總銷售額和清算資金的小計，您可以這樣做：

SELECT SUM(Total.`Price`) AS ClearedFunds 
FROM (
    SELECT `Price` FROM PROPERTY WHERE `Status` = 'Sold' 
    UNION ALL 
    SELECT (`Amount` * -1) AS `Price` FROM PAYMENT1 WHERE `Status` = 'Cleared' 
    UNION ALL 
    SELECT (`Amount` * -1) AS `Price` FROM PAYMENT2 WHERE `Status` = 'Cleared' 
    UNION ALL 
    SELECT (`Amount` * -1) AS `Price` FROM PAYMENT3 WHERE `Status` = 'Cleared' 
) AS Total; 

我假設你是想從這裏銷售總額減去清算資金。

Answer 2

您可以使用SELECT ... INTO ...，你的情況：

SELECT SUM(Cf.Amount) AS ClearedFunds 
FROM (
SELECT Amount FROM PAYMENT1 WHERE `Status` = "Cleared" 
UNION ALL 
SELECT Amount FROM PAYMENT2 WHERE `Status` = "Cleared" 
UNION ALL 
SELECT Amount FROM PAYMENT3 WHERE `Status` = "Cleared") INTO @cf; 

SELECT SUM(Price) AS TotalSales 
FROM PROPERTY 
WHERE Status = 「Sold」 INTO @ts; 

然後你就可以。減去或以任何其它查詢中使用它們，就像這樣：

SELECT @ts - @cf; 

Answer 3

你在找這個？

SELECT C.ClearedFunds - P.TotalSales 
FROM (
SELECT SUM(Cf.Amount) AS ClearedFunds 
FROM (
SELECT Amount FROM PAYMENT1 WHERE `Status` = "Cleared" 
UNION ALL 
SELECT Amount FROM PAYMENT2 WHERE `Status` = "Cleared" 
UNION ALL 
SELECT Amount FROM PAYMENT3 WHERE `Status` = "Cleared") AS Cf) C, 
(SELECT SUM(Price) AS TotalSales 
FROM PROPERTY 
WHERE Status = 「Sold」) P 
; 

Answer 4

你幾乎沒有......這裏的工作SQL：

SELECT (SELECT SUM(Cf.Amount) AS ClearedFunds 
FROM (
SELECT Amount FROM PAYMENT1 WHERE `Status` = "Cleared" 
UNION ALL 
SELECT Amount FROM PAYMENT2 WHERE `Status` = "Cleared" 
UNION ALL 
SELECT Amount FROM PAYMENT3 WHERE `Status` = "Cleared") as Cf) 

- (SELECT SUM(Price) AS TotalSales 
FROM PROPERTY 
WHERE Status = "Sold") as Result; 

這裏的SQL小提琴，這樣就可以用測試數據玩：您的回覆，邁克http://sqlfiddle.com/#!2/18677/11