SQL 错误 [1055] [42000]: Expression #2 of SELECT list is not in GROUP BY clause and contains nonaggreg

ERROR 1055 (42000): Expression #1 of SELECT list is not in GROUP BY clause and contains nonaggregated column 'mome.a.type' which is not functionally dependent on columns in GROUP BY clause; this is incompatible with sql_mode=only_full_group_by

首先通过SQL查询全局sql_mode模式：

select @@global.sql_mode;

发现已开启开启only_full_group_by模式，我们可以通过如下方式修改：

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

查询显示修改成功，重新连接，再次使用group by，成功查询！