mysql语句使用group by报错问题解决方案

mysql8版本出现下面问题

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

这个问题产生的原因是新版本的mysql不支持sql_mode=only_full_group_by

解决方案是设置别的

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

一劳永逸的方法，重启mysql服务也不会失效，在mysql配置文件my.in里配置如下，再重启mysql服务

[mysqld]
sql_model=STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_ENGINE_SUBSTITUTION