sql_mode=only_full_group_by的mysql5.6升级5.7的问题

mysql5.7使用group by分组时，查询字段没有分组的字段就会报错

[Err] 1055 - Expression #1 of SELECT list is not in GROUP BY clause and contains nonaggregated column 'test.user.id' 
which is not functionally dependent on columns in GROUP BY clause; this is incompatible with sql_mode=only_full_group_byy

原因：

mysql5.7以上默认开启了only_full_group_by 模式

 

解决方法：

1、查看sql_mode

SELECT @@sql_mode;

查询结果

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

2、将查询的结果去掉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

在win系统找到mysql的my.ini文件，在文件中添加：

sql_mode=STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION

　完整的my.ini文件内容

[[mysqld]
port = 3306
basedir=D:/MySQL/mysql-5.7.24-winx64
datadir=D:/MySQL/mysql-5.7.24-winx64/data 
max_connections=200
character-set-server=utf8
default-storage-engine=INNODB
sql_mode=STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION  

[mysql]
default-character-set=utf8b

保存好后，重启mysql服务

 

 

Linux下修改mysql的my.cnf配置文件

找到my.cnf中的[mysqld]在内增加:

sql_mode=STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION  

　　

保存好后，重启mysql服务