MySql 5.7+ ONLY_FULL_GROUP_BY 引发问题解决方法

一般都是使用group by 引发的异常

-Expression #1 of SELECT list is not in GROUP BY clause and contains nonaggregated column ‘###’…
this is incompatible with sql_mode=only_full_group_by

原因：mysql 5.7+ 版本only_full_group_by SQL 默认开启

其实就是使用了oracle的group规则啦，导致旧版本写的sql无法通过

解决方法：

mysql> SHOW SESSION VARIABLES;
mysql> SHOW GLOBAL VARIABLES;
mysql> select @@sql_mode;

得到sql-mode例如：

ONLY_FULL_GROUP_BY,STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_ENGINE_SUBSTITUTION

注意：不要复制，个人数据库配置不同，将所查的sql_mode去除ONLY_FULL_GROUP_BY后重新set

set global sql_mode='STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_ENGINE_SUBSTITUTION'
set session sql_mode='STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_ENGINE_SUBSTITUTION'

ps: 直接设置sql_mode为修改全局变量，只对新建数据库有效，已有数据库需进入后执行上方set代码

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