执行sql:

SELECT * FROM `user_link` WHERE `group_id` IN ('78', '79') GROUP BY `link_id`　　　

报错：

SQLSTATE[42000]: Syntax error or access violation: 1055 Expression #2 of SELECT list is not in GROUP BY clause and contains nonaggregated column 'user_link.group_id' which is not functionally dependent on columns in GROUP BY clause; 
this is incompatible with sql_mode=only_full_group_by

The SQL being executed was: SELECT * FROM `user_link` WHERE `group_id` IN ('78', '79') GROUP BY `link_id`

执行查看：select @@sql_mode;

里面默认设置了：sql_mode=only_full_group_by

only_full_group_by ：使用这个就是使用和oracle一样的group 规则, select的列都要在group中,或者本身是聚合列(SUM,AVG,MAX,MIN) 才行，其实这个配置目前个人感觉和distinct差不多的，所以去掉就好

或者修改sql语句

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