mysql5.7 用group by出现如下报错
Expression #1 of SELECT list is not in GROUP BY clause and contains nonaggregated column 'xxxxx' which is not functionally dependent on columns in GROUP BY clause; this is incompatible with sql_mode=only_full_group_by
解决办法如下：
方法一
1、执行如下语句查看sql_model
SHOW SESSION VARIABLES;
SHOW GLOBAL VARIABLES;
2、可见session和global的sql_model都为
ONLY_FULL_GROUP_BY,STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION
only_full_group_by ：这个和oracle的group是一样的规则，select的列都要在group中，或者本身是聚合列(SUM,AVG,MAX,MIN) 才行
建议去掉only_full_group_by就好
3、解决办法
set session sql_mode= 'STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION'
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'
注意：记得先执行session，再执行global，我试过先执行global，还是会报错
方法二
见好多博客中写，但我执行后依然报错，建议使用方法一，亲测可行！
select @@global.sql_mode
set @@sql_mode='STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION';