MySQL报错“Expression ＃1 of SELECT list is not in GROUP BY clause and contains nonaggre”解决方法

解决MySQL5.7版本之后使用GROUP BY语句时报错

• 问题原因
• 解决方法

今天使用mysql简单的一句分组查询语句（GROUP BY）报错了。

mysql> SELECT * FROM tb GROUP BY empid;
ERROR 1055 (42000): Expression #2 of SELECT list is not in GROUP BY clause and contains nonaggregated column 'db1.tb.sales' which is not functionally dependent on columns in GROUP BY clause; this is incompatible with sql_mode=only_full_group_by

查了问题原因和解决方法，成功解决。

问题原因

原因：使用GROUP BY 语句违背了sql_mode=only_full_group_by。因为mysql版本5.7之后默认的模式是ONLY_FULL_GROUP_BY。官网文档的原话：