带有IF条件的MYSQL求和查询

MYSQL Sum Query with IF Condition(带有IF条件的MYSQL求和查询)

问题描述

我正在为 SUM 上具有多个 IF 条件的报表构建查询.我在 SUM 上遇到多个 IF 条件的问题.

I am building a query for a report with multiple IF conditions on the SUM. I am having problems with a multiple IF conditions on the SUM.

这里是查询:

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

这个查询工作得很好.

当我尝试添加以下条件 SUM 语句时:

When I try to add the below conditional SUM statement:

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

此条件 IF 语句失败.

This conditional IF statement fails out.

我有一个名为TotalAmount"的列和一个名为PaymentType"的列我希望创建每天信用卡交易的总和、每天支票交易的总和、贝宝交易的总和每天，.我试图创建一个子查询，但这会返回整个 TotalAmount 列的值，而不是按天细分.

I have a column called 'TotalAmount' and a column called 'PaymentType' I am looking to create a SUM of the credit card transactions by each day, a SUM of the checks transactions by each day, a SUM of the paypal transactions by each day,. I have tried to create a subquery but this returns a value for the entire TotalAmount column, not broken down by day.

推荐答案

试试 CASE 这样:

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

应该给你正在寻找的东西......

Should give what you are looking for ...

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