环境：Server version: 5.7.27-0 ubuntu 18.04.1 (Ubuntu)

执行分组语句：select * from pet group by owner;时报错：

mysql>show global variables; 会发现sql_mode的值确实为only_full_group_by

only_full_group_by表示select字段要存在于被分组的字段中，当然聚合函数count，avg，sum,min,max是没问题的。

解决办法：修改全局变量值和会话变量值，命令行输入

 set session sql_mode ='STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FFOR_DIVISION_BY_ZERO,NO_ENGINE_SUBSTITUTION';
 set global sql_mode ='STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FFOR_DIVISION_BY_ZERO,NO_ENGINE_SUBSTITUTION';

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