帶IF條件的MYSQL求和查詢

我正在爲SUM上的多個IF條件構建查詢。我在SUM上遇到了多個IF條件問題。帶IF條件的MYSQL求和查詢

下面是該查詢：

SELECT SUM(`totalamount`) AS Total, 
SUM(`PayPalFee`) AS Fees, 
DATE(`TransactionDate`) AS `Day`, 
SUM(IF(PaymentType = "paypal", 1,0)) AS Paypal, 
SUM(IF(PaymentType = "check", 1,0)) AS Checks, 
SUM(IF(PaymentType = "credit card", 1,0)) AS CreditCard, 
COUNT(*) AS Entries 
FROM my_table 
WHERE TransactionDate between '2011-05-05' AND '2012-01-30' 
GROUP BY day 
ORDER BY `day` ASC

此查詢的工作就好了。

當我嘗試添加以下條件求和聲明：

SUM('TotalAmount'(PaymentType = "credit card", 1,0)) AS CreditCardTotal,

此條件IF語句失敗了。

我有一個名爲'TotalAmount'的列和一個名爲'PaymentType'的列我期待每天創建信用卡交易的SUM，每天支票交易的總和，PayPal的SUM每天的交易。我試圖創建一個子查詢，但是這會返回整個TotalAmount列的值，而不是按天細分。

來源

2012-01-04 Matthew Colley

嘗試以這種方式CASE：

SUM(CASE WHEN PaymentType = "credit card" THEN TotalAmount ELSE 0 END) AS CreditCardTotal,

應該給你在找什麼...

來源

2012-01-04 18:39:04 aleroot

太棒了！謝謝，我不能接受，但我會。 – 2012-01-04 18:40:50

@aleroot'SUM（CASE WHEN .. THEN .. ELSE .. END）'和'SUM（IF（..，..，..））'之間有什麼區別，當我只想檢查一個條件如果一些布爾字段是1）？我的意思是，哪一個應該更快？ – NHG 2014-02-10 13:36:53

可以這樣做，如果例如：SUM（IF（PaymentType =「creditcard」，TotalAmount，0）AS CreditCardTotal，' – George 2014-06-05 14:34:08

這個怎麼樣？

SUM(IF(PaymentType = "credit card", totalamount, 0)) AS CreditCardTotal

來源

2012-01-04 18:40:16

帶IF條件的MYSQL求和查詢

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