记录：
Mysql安装后设置 D:\phpstudy_pro\Extensions\MySQL5.7.26\my.ini
避免[Err]1055 - xxx GROUP BY xxx 错误。
[mysqld]
sql_mode=STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_ENGINE_SUBSTITUTION