MySQL 8 groupby 禁用，无效解决办法

MySQL8 默认不支持GroupBy，可通过如下命令查询，如果发现 ONLY_FULL_GROUP_BY 则说明未开启 GroupBY。

开启前查询结果：

mysql> select @@sql_mode;
+----------------------------------------------------------------------------------------------------+
| @@sql_mode                                                                                         |
+----------------------------------------------------------------------------------------------------+
| ONLY_FULL_GROUP_BY,STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_ENGINE_SUBSTITUTION |
+----------------------------------------------------------------------------------------------------+

开启 GroupBY：

vim /etc/mysql/mysql.conf.d/mysqld.conf
# [mysqld] 修改或添加如下配置
sql_mode=STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_ENGINE_SUBSTITUTION

重启 MySQL 后查询结果：

mysql> select @@sql_mode;
+----------------------------------------------------------------------------------------------------+
| @@sql_mode                                                                                         |
+----------------------------------------------------------------------------------------------------+
| STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_ENGINE_SUBSTITUTION |
+----------------------------------------------------------------------------------------------------+