Expression #1 of SELECT list is not in GROUP BY clause and contains nonaggregate

野性酷女 2021-10-23 19:34 162阅读 0赞

### Expression \#1 of SELECT list is not in GROUP BY clause and contains nonaggregate ###

*   *   *  原因
         *  修改
         *  原因分析
         *  附录

### 原因 ###

聚合查询出现这样的报错是因为mysql设定的mode含有 ONLY_FULL_GROUP_BY

mysql> select @@sql_mode;
    +-------------------------------------------------------------------------------------------------------------------------------------------+
    | @@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 row in set (0.00 sec)

### 修改 ###

在配置文件修改:使用rpm安装的配置文件默认是/etc/my.cnf

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ppYW5nMTgyMzgwMzI4OTE_size_16_color_FFFFFF_t_70]

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> select @@sql_mode;
    +------------------------------------------------------------------------------------------------------------------------+
    | @@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 row in set (0.00 sec)

然后重启服务即可

### 原因分析 ###

根据网上的例子，我自己重现了一下，参考资料：https://www.cnblogs.com/fswhq/p/9729761.html、https://www.cnblogs.com/fireporsche/p/8618691.html

我在数据库新建一张表，game，存有以下数据  
![在这里插入图片描述][20190816093617342.png]

当我执行以下sql语句的时候，会出现错误

sql语句：select name, group_id from game group by group_id;

错误：

1055 - Expression \#1 of SELECT list is not in GROUP BY clause and contains nonaggregated column ‘t.game.name’ which is not functionally dependent on columns in GROUP BY clause; this is incompatible with sql\_mode=only\_full\_group\_by

如果将ONLY\_FULL\_GROUP\_BY去掉，就不会报错

![在这里插入图片描述][20190816093658344.png]

sql语句的意思就是按组分类别，但是这里的B组存在两条记录，不知道返回哪条，所以就报错了。

其实mysql不会有什么问题的，出现这样的错误只能说我们写的sql语句存在问题

### 附录 ###

STRICT_TRANS_TABLES：
     在该模式下，如果一个值不能插入到一个事务表中，则中断当前的操作，对非事务表不做任何限制
    NO_ZERO_IN_DATE：
     在严格模式，不接受月或日部分为0的日期。如果使用IGNORE选项，我们为类似的日期插入'0000-00-00'。在非严格模式，可以接受该日期，但会生成警告。
    NO_ZERO_DATE：
    在严格模式，不要将 '0000-00-00'做为合法日期。你仍然可以用IGNORE选项插入零日期。在非严格模式，可以接受该日期，但会生成警告
    ERROR_FOR_DIVISION_BY_ZERO：
    在严格模式，在INSERT或UPDATE过程中，如果被零除(或MOD(X，0))，则产生错误(否则为警告)。如果未给出该模式，被零除时MySQL返回NULL。如果用到INSERT IGNORE或UPDATE IGNORE中，MySQL生成被零除警告，但操作结果为NULL
    NO_AUTO_CREATE_USER：
    防止GRANT自动创建新用户，除非还指定了密码。
    NO_ENGINE_SUBSTITUTION：
    如果需要的存储引擎被禁用或未编译，那么抛出错误。不设置此值时，用默认的存储引擎替代，并抛出一个异常

原文链接：https://blog.csdn.net/weixin\_40295575/article/details/91439312

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ppYW5nMTgyMzgwMzI4OTE_size_16_color_FFFFFF_t_70]: /images/20211023/32186dc185274b2db22c1b42d788c1a1.png
[20190816093617342.png]: /images/20211023/785f30a87fe24775ab31ecb836e2c74c.png
[20190816093658344.png]: /images/20211023/50bf68b378b14e28aad68add200cf6e3.png

Expression #1 of SELECT list is not in GROUP BY clause and contains nonaggregate

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