which is not functionally dependent on columns in GROUP BY clause； this is incompatible with sql_mod

- 日理万妓 2023-09-27 18:58 16阅读 0赞

**mysql 执行报错**：

> Expression \#2 of SELECT list is not in GROUP BY clause and contains  
> nonaggregated column ‘bcdsystem.cities.city’ which is not functionally  
> dependent on columns in GROUP BY clause; this is incompatible with  
> sql\_mode=only\_full\_group\_by"

1.这个错误发生在mysql 5.7 版本及以上版本会出现的问题：

mysql 5.7版本默认的sql配置是:sql_mode="ONLY_FULL_GROUP_BY"，这个配置严格执行了"SQL92标准"

2.在sql执行时，出现该原因：

简单来说就是：输出的结果是叫target list，就是select后面跟着的字段，还有一个地方group by column，就是
    
        group by后面跟着的字段。由于开启了ONLY_FULL_GROUP_BY的设置，所以如果一个字段没有在target list 
    
        和group by字段中同时出现，或者是聚合函数的值的话，那么这条sql查询是被mysql认为非法的，会报错误。

3.解决方法  
1）可以采取临时解决方法，但mysql重启后仍然会报这个错误

> 查看版本号：select version();

可以看到我的版本是5.7版本以上的，  
　　　 ![在这里插入图片描述][632596e4c1864c7880f1aca8f28f30f4.png]

> 查询模型：SELECT @@GLOBAL.sql\_mode; SELECT @@SESSION.sql\_mode;

![在这里插入图片描述][c9aeb93d13c7418a984bdda1fa3b1f25.png]  
可以看到mysql的配置是含有sql\_mode="ONLY\_FULL\_GROUP\_BY"的，

接下来执行以下4条sql语句即可解决 (**重启mysql会失效**)：

set sql_mode='STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,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';
     
    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';

2）最终解决办法：修改MySQL的配置文件

我是在linux服务上用docker安装的mysql，进入mysql容器中，进入/etc/mysql目录下修改my.cnf文件

vim /etc/mysql/my.cnf

在 \[mysqld\] 下面添加代码：

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

**【例外】**  
但是经过我cat my.conf 发现此配置文件并没有\[mysqld\]这一项 看到配置文件中引入了/etc/mysql/conf.d/， /etc/mysql/mysql.conf.d/两个目录中的文件

经过查看 在引入的文件mysql.conf.d文件夹下有个mysqld.cnf文件中含有\[mysqld\]配置 便在该配置文件中加入上述的配置，保存之后重启mysql容器，这样便可永久解决问题。

vim /etc/mysql/mysql.conf.d/mysqld.cnf

添加如下语句：

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

> ps:不同的系统，mysql 的配置文件名以及路径不同  
> 1、Mac或Linux文件 /etc/my.cnf  
> 2、windows 在数据库安装目录下的 my.ini

[632596e4c1864c7880f1aca8f28f30f4.png]: https://img-blog.csdnimg.cn/632596e4c1864c7880f1aca8f28f30f4.png
[c9aeb93d13c7418a984bdda1fa3b1f25.png]: https://img-blog.csdnimg.cn/c9aeb93d13c7418a984bdda1fa3b1f25.png

which is not functionally dependent on columns in GROUP BY clause； this is incompatible with sql_mod

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