MySQL-Expression #1 of SELECT list is not in GROUP BY clause and contains nonaggre

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

解决方案

• 先使用 SQL 查询

select @@global.sql_mode

查出来的值为：
ONLY_FULL_GROUP_BY,STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION

• 此时去掉ONLY_FULL_GROUP_BY，然后重新设置值（引号中填写裁剪后的字符串）

set @@global.sql_mode='';

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