MySQL的SELECT列表是不是在GROUP BY子句中包含非聚合列

Question

我使用MySQL 5.7，和我得到这个查询时出现错误：如果我改变GROUP BY MONTH(created) 与

SELECT 
    COUNT(id) AS sales, 
    SUM(amount) AS total, 
    created 
    FROM 
    `payments` 
    WHERE status =1 
    GROUP BY MONTH(created); 

：

GROUP BY created 

然后错误消失。我没有访问my.ini，对sql_mode进行更改。

Answer 1

既然你一个月明智组，你shold输出的几个月也

SELECT COUNT(id) AS sales, 
     SUM(amount) AS total, 
     MONTH(created) 
    FROM payments 
    WHERE status = 1 
    GROUP BY MONTH(created) 

否则MySQL有挑选从组中created值。但是你应该定义要显示的内容。

另一种可能性，而不是输出MONTH(created)将是像min(created)这样的日期聚合，它会输出每月的最早日期。