Group by 查询时遇见 ONLY FULL GROUP BY 错误

系统环境

Ubuntu16.04+MySQL5.7.27；

问题

将数据从旧的数据库（MySQL5.1）迁移到新的数据库（MySQL5.7）中时，查询语句不变的情况下，报如下错；

Cause: java.sql.SQLException:
Expression #1 of SELECT list is not in GROUP BY clause and contains nonaggregated column 'mwyq_db.news.news_time' 
which is not functionally dependent on columns in GROUP BY clause; 
this is incompatible with sql_mode=only_full_group_by

解决方法

查看sql-mode

修改后应该如下图所示，未修改前有ONLY_FULL_GROUP_BY选项；

SELECT @@sql_mode;
SELECT @@GLOBAL.sql_mode;
SELECT @@session.sql_mode;

修改sql-mode

• 临时修改

以root用户进入mysql，然后添加如下配置；

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

• 永久修改

1. vim /etc/mysql/my.cnf
2. 在mysqld节点下添加：

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

注意

MySQL8.0中，不支持NO_AUTO_CREATE_USER，所以在修改配置时，需要将这一项去掉；