ERROR 1055 (42000): Expression #2 of SELECT list is not in GROUP BY clause and contains nonaggregate

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本文介绍在MySQL5.7中使用Group By时遇到的ERROR1055问题及解决方案。通过调整my.cnf或my.ini配置文件中的sql_mode设置来避免ONLY_FULL_GROUP_BY模式引发的错误。

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在mysql 5.7初次使用group by时会出现错误,首先表信息如下:
ERROR 1055 (42000): Expression #2 of SELECT list is not in GROUP BY clause and contains nonaggregated column ‘test.score.id’ which is not functionally dependent on columns in GROUP BY clause; this is incompatible with sql_mode=only_full_group_by

select c_name,id from score group by c_name;

在这里插入图片描述
查看一下MySQL5.7的检查模式

在这里插入图片描述

通过修改my.cnf或者my.ini配置文件去掉ONLY_FULL_GROUP_BY一项(如果没有这个配置项则新建)
在文件里加上下面一行

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

然后重启mysql
此时就不会在出现ONLY_FULL_GROUP_BY
在这里插入图片描述

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