MySQL - MySQL使用group by查询报错SELECT list is not in GROUP BY clause and contains nonaggregated column..

蔚落 2024-03-24 20:05 22阅读 0赞

使用MySQL进行分组group by查询时，报错了，报错如下：

org.springframework.jdbc.BadSqlGrammarException: 
    ### Error querying database.  Cause: java.sql.SQLSyntaxErrorException: Expression #1 of SELECT list is not in GROUP BY clause and contains nonaggregated column 'XX.XX' which is not functionally dependent on columns in GROUP BY clause; this is incompatible with sql_mode=only_full_group_by
    ### The error may exist in file [D:\workspace\XX\target\classes\mapper\XXMapper.xml]
    ### The error may involve defaultParameterMap
    ### The error occurred while setting parameters
    ### SQL: SELECT a.id         FROM         table a         INNER JOIN table b ON a.dept_id = b.id   GROUP BY         a.dept_id
    ### Cause: java.sql.SQLSyntaxErrorException: Expression #1 of SELECT list is not in GROUP BY clause and contains nonaggregated column 'xx.xx' which is not functionally dependent on columns in GROUP BY clause; this is incompatible with sql_mode=only_full_group_by

![68d4a6b2a021431da35dcd71ca144944.png][]

#### 报错原因 ####

因为Sql语句SELECT后面的列包含了group by后面没有的列并且没有使用聚合函数

MySQL官网介绍：

[https://dev.mysql.com/doc/refman/8.0/en/group-by-handling.html][https_dev.mysql.com_doc_refman_8.0_en_group-by-handling.html]

[https://dev.mysql.com/doc/refman/8.0/en/sql-mode.html\#sqlmode\_only\_full\_group\_by][https_dev.mysql.com_doc_refman_8.0_en_sql-mode.html_sqlmode_only_full_group_by]

这种模式的官方解释：

1、**ONLY\_FULL\_GROUP\_BY**是MySQL数据库提供的一个sql\_mode, 通过这个 sql\_mode 来保证, SQL语句 “分组求最值” 合法性的检查.。

这种模式采用了与 Oracle、DB2 等数据库的处理方式。即不允许 select target list 中出现语义不明确的列

2、对于用到 GROUP BY 的 select 语句, 查出来的列必须是 group by 后面声明的列, 或者是聚合函数里面的列有这样一个数据库的表

因此，这种模式的特点是：

1、只要有聚合函数 sum()，count()，max()，avg() 等函数就需要用到 group by , 否则就会报上面的错误

2、group by id (id 是主键) 的时候, select 什么都没有问题, 包括有聚合函数

3、group by role (非主键) 的时候, select 只能是聚合函数和 role ( group by 的字段) , 否则报错

#### 解决办法 ####

由上面官网介绍得知，要么修改sql语句将未进行group by 的列，使用any\_value() 处理；要么禁用ONLY\_FULL\_GROUP\_BY(脚本如下)

mysql> SET GLOBAL sql_mode=(SELECT REPLACE(@@sql_mode,'ONLY_FULL_GROUP_BY',''));
    
    mysql> SELECT @@GLOBAL.sql_mode;
    +---------------------------------------------------------------+
    | @@GLOBAL.sql_mode                                            |
    +---------------------------------------------------------------+
    | STRICT_TRANS_TABLES,NO_ENGINE_SUBSTITUTION |
    +---------------------------------------------------------------+

sql\_model常用字段含义

ONLY_FULL_GROUP_BY：对于GROUP BY聚合操作，如果在SELECT中的列，没有在GROUP BY中出现，那么这个SQL是不合法的，因为列不在GROUP BY从句中
    
    NO_AUTO_VALUE_ON_ZERO：该值影响自增长列的插入。默认设置下，插入0或NULL代表生成下一个自增长值。如果用户希望插入的值为0，而该列又是自增长的，那么这个选项就有用了。
    
    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，对非事务表不做限制
    
    NO_ZERO_IN_DATE：在严格模式下，不允许日期和月份为零
    
    NO_ZERO_DATE：设置该值，mysql数据库不允许插入零日期，插入零日期会抛出错误而不是警告。
    
    ERROR_FOR_DIVISION_BY_ZERO：在INSERT或UPDATE过程中，如果数据被零除，则产生错误而非警告。如果未给出该模式，那么数据被零除时MySQL返回NULL
    
    NO_AUTO_CREATE_USER：禁止GRANT创建密码为空的用户
    
    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
    
    PIPES_AS_CONCAT：将”||”视为字符串的连接操作符而非或运算符，这和Oracle数据库是一样的，也和字符串的拼接函数Concat相类似

[68d4a6b2a021431da35dcd71ca144944.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/13/0f20ced084a64ef1be6ec79e2cfad4b0.png
[https_dev.mysql.com_doc_refman_8.0_en_group-by-handling.html]: https://dev.mysql.com/doc/refman/8.0/en/group-by-handling.html
[https_dev.mysql.com_doc_refman_8.0_en_sql-mode.html_sqlmode_only_full_group_by]: https://dev.mysql.com/doc/refman/8.0/en/sql-mode.html#sqlmode_only_full_group_by

MySQL - MySQL使用group by查询报错SELECT list is not in GROUP BY clause and contains nonaggregated column..

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