MySql执行分组sql报错:

Expression #1 of SELECT list is not in GROUP BY clause and contains nonaggregated
column 'db.tir1.display_name' which is not functionally dependent on columns in
GROUP BY clause; this is incompatible with sql_mode=only_full_group_by

原因:使用GROUP BY 语句违背了sql_mode=only_full_group_by,该SQL是不合法的。使用group by分组查询的时候,在select列中查询的字段在group by中不存在,并且改字段没有在聚合函数里面。会报sql不合法。 mysql 5.7默认启用ONLY_FULL_GROUP_BY特性。
解决方法

  1. 在mysql的配置文件的最后强制设置sql_mode,把默认的ONLY_FULL_GROUP_BY去掉。
    重新启动mysql后生效。
  2. 全局配置修改
    查询:
select @@global.sql_mode

设置:

SET @@global.sql_mode=
'STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION'

退出生效。对于新建的立即生效。
最后还是建议大家合法编写SQL语句进行。除非是业务需要,不然不到万不得已千万不要擅自修改配置信息。

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