MySQL关于"SELECT list is not in GROUP BY clause and contains nonaggregated column"错误

问题

今天在写sql的时候偶然发现这个错误:

 select * from user group by sex;
org.springframework.jdbc.BadSqlGrammarException: 
###Error querying database.  Cause: com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Expression #3 of SELECT list is not in GROUP BY clause and contains nonaggregated column 'table' which is not functionally dependent on columns in GROUP BY clause; this is incompatible with sql_mode=only_full_group_by

原因

前面做主从同步的时候把mysql做了一次升级,升至mysql5.7,查看错误信息中的sql_mode

select @@global.sql_mode;
+------------------------------------------------------------------------------------------------------------------------+
| @@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 |
+------------------------------------------------------------------------------------------------------------------------+

发现5.7默认配置了only_full_group_by这个模式,只需将配置修改即可。

解决

vim /etc/my.cnf

在配置文件中增加一行:
[mysqld]
...
@@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
...

之后再重启MySQL服务:

systemctl restart mysqld

问题解决~

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回答: 当使用GROUP BY语句进行查询时,SELECT语句中只能包含GROUP BY后面声明的列或者聚合函数。这是因为MySQL的ONLY_FULL_GROUP_BY模式要求SELECT语句中的列必须是明确的,以确保分组求最值的合法性检查。这种模式采用了与Oracle、DB2等数据库的处理方式。因此,如果在GROUP BY语句中使用了聚合函数,就需要将SELECT语句中的列限制在GROUP BY后面声明的列或者聚合函数中。如果SELECT语句中出现了不明确的列,就会报错"SELECT list is not in GROUP BY clause and contains nonaggregated column"。\[1\]\[2\]\[3\] #### 引用[.reference_title] - *1* [mysql使用group by查询报错SELECT list is not in GROUP BY clause and contains nonaggregated column.](https://blog.youkuaiyun.com/weixin_40925480/article/details/127680083)[target="_blank" data-report-click={"spm":"1018.2226.3001.9630","extra":{"utm_source":"vip_chatgpt_common_search_pc_result","utm_medium":"distribute.pc_search_result.none-task-cask-2~all~insert_cask~default-1-null.142^v91^insertT0,239^v3^insert_chatgpt"}} ] [.reference_item] - *2* *3* [mysql使用group by查询报错SELECT list is not in GROUP BY clause and contains nonaggregated column......](https://blog.youkuaiyun.com/weixin_37557729/article/details/123896433)[target="_blank" data-report-click={"spm":"1018.2226.3001.9630","extra":{"utm_source":"vip_chatgpt_common_search_pc_result","utm_medium":"distribute.pc_search_result.none-task-cask-2~all~insert_cask~default-1-null.142^v91^insertT0,239^v3^insert_chatgpt"}} ] [.reference_item] [ .reference_list ]
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