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：

说人话，大概意思就是说（使用google翻译）：

拒绝选择列表、HAVING 条件或 ORDER BY 列表引用非聚合列的查询，这些列既不在 GROUP BY 子句中命名，也不在功能上依赖于（唯一确定的）GROUP BY 列。

从 MySQL 5.7.5 开始，默认 SQL 模式包括 ONLY_FULL_GROUP_BY。（在 5.7.5 之前，MySQL 不检测函数依赖，并且默认不启用 ONLY_FULL_GROUP_BY。有关 5.7.5 之前的行为的描述，请参阅 MySQL 5.6 参考手册。）

标准 SQL 的 MySQL 扩展允许在 HAVING 子句中引用选择列表中的别名表达式。在 MySQL 5.7.5 之前，启用 ONLY_FULL_GROUP_BY 会禁用此扩展，因此需要使用非别名表达式编写 HAVING 子句。从 MySQL 5.7.5 开始，此限制被取消，因此 HAVING 子句可以引用别名，无论是否启用了 ONLY_FULL_GROUP_BY。

解决方法

1、先使用SQL查询sql_mode

select @@global.sql_mode

2、重新设置sql_mode，删除ONLY_FULL_GROUP_BY

set @@global.sql_mode ='STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_ENGINE_SUBSTITUTION'

3、退出重进


# 退出
quit
# 再次登录（命令行模式）
mysql -u root -p

再次执行查询语句，

SELECT * FROM tb GROUP BY empid;

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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

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