MySQL 报错 :Expression #1 of SELECT list is not in GROUP BY clause and contains nonaggre

错误日志:

Caused by: com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Expression #1 of SELECT list is not in GROUP BY clause and contains nonaggregated column 'cheyintongdemo.a.id' which is not functionally dependent on columns in GROUP BY clause; this is incompatible with sql_mode=only_full_group_by

这是由于违背了mysql5.7以后默认配置的sql_mode=only_full_group_by模式

如果启用了ONLY_FULL_GROUP_BY SQL模式(默认情况下),MySQL将拒绝选择列表,HAVING条件或ORDER BY列表的查询引用在GROUP BY子句中既未命名的非集合列,也不在功能上依赖于它们。(5.7.5之前,MySQL没有检测到功能依赖关系,默认情况下不启用ONLY_FULL_GROUP_BY。有关5.7.5之前的行为的说明,请参见“MySQL 5.6参考手册”。)

MySQL扩展到标准SQL允许在have子句中引用select列表中的别名表达式。在MySQL 5.7.5之前,enablingONLY_FULL_GROUP_BY禁用此扩展,因此需要使用unaliated表达式编写have子句。从MySQL 5.7.5开始,这个限制被取消,使得have子句可以引用别名,而不管是否启用了ONLY_FULL_GROUP_BY。

具体操作如下:

  1. 全局配置,对于新建数据库直接生效
SELECT @@global.sql_mode;
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
  1. 去掉ONLY_FULL_GROUP_BY
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'

(对于具体的数据库修改配置

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';

)

set 这个语句只当前会话生效,一旦重启mysql服务,还是会依然报这个错误。

推荐使用下面的方法,设置mysql的配置文件:

  1. 查看模式中是否有only_full_group_by
select @@global.sql_mode
  1. 删除only_full_group_by
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';
  1. 配置my.cnf,增加如下
sql_mode=STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION
  1. 保存后重启mysql
systemctl restart mysqld.service

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