Question

我试图让下面的语句与mysql v5.7.5一起使用，虽然真的根本不理解错误消息中的措辞，文档也没有帮助我。

有问题的SQL语句：

    SELECT 
        YEARWEEK(ts) AS YW, 
        DATE(ts) AS D,  
        SUM(`group-size`) AS `sum` 
    FROM `event` 
    GROUP BY YEARWEEK(ts);

我得到的错误：

Expression #2 of SELECT list is not in GROUP BY clause and contains
nonaggregated column 'event.ts' which is not functionally dependent on
columns in GROUP BY clause; this is incompatible with sql_mode=only_full_group_by

有人可以用英语解释我怎么能让它运作起来？对我来说，SQL语句非常有意义，但每次只是抛出错误。

Answer 1

请参阅longer answer：

简而言之，您需要在GROUP BY中添加不包含聚合函数的所有列。在这种特殊情况下，＆＃34; date（ds）＆＃34;需要添加：

SELECT 
    YEARWEEK(ts) AS YW, 
    DATE(ts) AS D,  
    SUM(`group-size`) AS `sum` 
FROM `event` 
GROUP BY YEARWEEK(ts), DATE(ts);

使用only_full_group_by

1 个答案: