Question

我正在为SUM上的多个IF条件的报表构建查询。我在SUM上遇到多个IF条件的问题。

以下是查询：

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

此查询工作正常。

当我尝试添加以下条件SUM语句时：

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

此条件IF语句失败。

我有一个名为'TotalAmount'的列和一个名为'PaymentType'的列我希望每天创建一个信用卡交易的SUM，每天检查交易的总和，paypal交易的总和每天，我试图创建一个子查询，但这会返回整个TotalAmount列的值，而不是按天分解。

Answer 1

以这种方式尝试CASE：

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

应该给你想要的东西......

Answer 2

这个怎么样？

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

IF条件下的MYSQL求和查询

2 个答案: