mysql:报错Expression #1 of SELECT list is not in GROUP BY clause and contains nonag
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声明:
- 原文作者【CSDN】:lankun66
- 原文地址:https://blog.csdn.net/qq_44625080/article/details/104043682
前言
- 最新在开发中遇到了一个问题,就是在代码书写中我用了 GroupBy做去重处理。在开发环境测试是好的,但是发布到测试就报了如下错误。
- 报错:Expression #1 of SELECT list is not in GROUP BY clause and contains nonaggre
- 后来问运维兄弟才知道:测试环境的 mysql 升级了:5.7.38版本
- 下面就是问题原因,大家可以参考一下。处理方法很简单,叫运维兄弟修改一下配置文件,重启mysql 即可。
1.描述:
数据库中的表grades为
id | gro | name | score
---------------------------
1 | A | 张三 | 20
2 | B | 李四 | 19
3 | B | 王五 | 17
4 | C | 赵六 | 18
SQL语句:
select name, gro from grades group by gro
返回:
Expression #1 of SELECT list is not in GROUP BY clause and contains nonaggregated column ‘grades.name’ which is not functionally dependent on columns in GROUP BY clause; this is incompatible with sql_mode=only_full_group_by
同样的SQL语句,在mysql5.5.43的数据库中报错,在5.7.5的mysql数据库中却正常。
2.分析:
对于上述的报错信息,在下的理解是select字段里包含了没有被group by条件唯一确定的字段name。
因为执行sql_make_group语句实际上把两行纪录李四和王五合并成一行,搜索引擎不知道该返回哪一条,所以报错。
3.原因:
MySQL 5.7.5后only_full_group_by成为sql_mode的默认选项之一,这可能导致一些sql语句失效。
4.解决方法:
vim /etc/mysql/conf.d/mysql.cnf
在配置文件my.cnf中关闭sql_mode=ONLY_FULL_GROUP_BY.。msqyl的默认配置是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。可以把ONLY_FULL_GROUP_BY去掉,也可以去掉所有选项设置成sql_mode=,如果你确信其他选项不会造成影响的话
。
复制并粘贴,如有[mysqld],则放到 [mysqld]最后,如没有则放到配置文件最下方即可
[mysqld]
sql_mode=STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION
wq保存并退出
重启MySQL
- service mysql restart
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