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ERROR 1055 (42000): Expression #1 of SELECT list is not in GROUP BY clause and.....错误

笙烛 2022-04-02 阅读 27
mysql

问题描述:

今天在学MySQL分组查询时抛出 ERROR 1055 (42000):Expression #1 of SELECT list is not in GROUP BY clause and contains nonaggregated column ‘test.stus.stu_num’ which is not functionally dependent on columns in GROUP BY clause; this is incompatible with sql_mode=only_full_group_by

我的MySQL版本是8.0.19

问题原因

ONLY_FULL_GROUP_BY的意思是:对于GROUP BY聚合操作,如果在SELECT中的列,没有在GROUP BY中出现,那么这个SQL是不合法的,因为列不在GROUP BY从句中,也就是说查出来的列必须在group by后面出现,否则就会报错,或者这个字段出现在聚合函数里面。

解决办法

需要把ONLY_FULL_GROUP_BY 关掉
命令行输入 :

 set sql_mode='STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_ENGINE_SUBSTITUTION';
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