SELECT list is not in GROUP BY clause and contains nonaggregated column

报错如下:

Expression #2 of SELECT list is not in GROUP BY clause and contains 
nonaggregated column ‘sss.month_id’ which is not functionally 
dependent on columns in GROUP BY clause; this is incompatible with 
sql_mode=only_full_group_by

问题出现的原因:
MySQL 5.7.5及以上功能依赖检测功能。如果启用了ONLY_FULL_GROUP_BY SQL模式(默认情况下),MySQL将拒绝选择列表,HAVING条件或ORDER BY列表的查询引用在GROUP BY子句中既未命名的非集合列,也不在功能上依赖于它们。(5.7.5之前,MySQL没有检测到功能依赖关系,默认情况下不启用ONLY_FULL_GROUP_BY。有关5.7.5之前的行为的说明,请参见“MySQL 5.6参考手册”。)以下解决方案并不是最终解决方案,只是屏蔽了报错,但问题依然存在。如有好的解决方案望告知谢谢!

解决方法一:

打开navcat,

用sql查询:

select @@global.sql_mode
//查询结果 : 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

去掉ONLY_FULL_GROUP_BY,重新设置值。

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’;

方法二:

找到mysql 配置文件设置

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

如果报错可执行如下命令

SELECT list is not in GROUP BY clause and contains nonaggregated column_第1张图片

 

方法三:

MySQL有any_value(field)函数,他主要的作用就是抑制ONLY_FULL_GROUP_BY值被拒绝

官方有介绍,地址:https://dev.mysql.com/doc/refman/5.7/en/miscellaneous-functions.html#function_any-value

我们可以把select语句中查询的属性(除聚合函数所需的参数外),全部放入any_value(field)函数中;

例如:select name,any_value(sex) from test_table group by name

这样sql语句不管是在ONLY_FULL_GROUP_BY模式关闭状态还是在开启模式都可以正常执行,不被mysql拒绝。



转载于:https://www.cnblogs.com/chancy/p/10026097.html

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