【mysql报错】MySQL5.7.27报错[Err] 1055 - Expression #1 of ORDER BY clause is not in GROUP BY clause and contains nonaggregated

mysql5.7.27在运行更新语句时出现如下情况，mysql5.6之前没有这种情况出现。

[Err] 1055 - Expression #1 of ORDER BY clause is not in GROUP BY clause and contains nonaggregated column 'information_schema.
PROFILING.SEQ' which is not functionally dependent on columns in GROUP BY clause; this is incompatible with sql_mode=only_full_group_by

原因

mysql5.7.5后，ONLY_FULL_GROUP_BY 默认为真，那么此时select中的字段必须出现在group by中，但是我们使用的语句时5.6的就语句。所以显而易见，旧新版本的问题。

 你可以使用语句查询自己数据库的版本

SELECT VERSION();

解决方法

先查看sql_mode

SHOW VARIABLES LIKE 'sql_mode';

查询结果如下

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

设置sql_mode的值，去掉"ONLY_FULL_GROUP_BY"

# mysql5.6版本的sql_mode为：STRICT_TRANS_TABLES,NO_ENGINE_SUBSTITUTION
SET sql_mode='STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION';

最后运行更新语句则不会报错了

UPDATE 表名 t SET t.需要需改的字段名 = '需要修改的值' where t.根据条件字段1 = '条件字段1值' and t.条件字段2= '条件字段2值';

如下图所示，没有报错信息