报错：

1 of ORDER BY clause is not in SELECT list, references column 'xxx' which is not in SELECT list

最近发现有个sql

执行报错：
xpression #1 of ORDER BY clause is not in SELECT list, references column ‘database.table.column’ which is not in SELECT list; this is incompatible with DISTINCT

以下是程序执行的原sql：

select
	distinct sub_order_no ,
	item_snapshot_id
from
	tab_od_item toi
where
	toi.sub_order_no in('111','222')
	order by id

查阅资料发现在mysql5.7.5(Tidb的mysql模式)及以上版本实现了对功能依赖的检测。默认启用了ONLY_FULL_GROUP_BY SQL模式。在该模式下：

1、当使用GROUP BY查询时，出现在SELECT字段后面的只能是GROUP BY后面的分组字段，或使用聚合函数包裹着的字段，否则会报错如下信息：Expression #1 of SELECT list is not in GROUP BY clause and contains nonaggregated column 'database.table.column' which is not functionally dependent on columns in GROUP BY clause; this is incompatible with sql_mode=only_full_group_by

2、当使用ORDER BY查询时，不能使用SELECT DISTINCT去重查询。否则会报错如下信息：Expression #1 of ORDER BY clause is not in SELECT list, references column 'database.table.column' which is not in SELECT list; this is incompatible with DISTINCT

解决办法

关闭sql_mode=ONLY_FULL_GROUP_BY模式即可

1、查看是否开启了ONLY_FULL_GROUP_BY规则校验，在数据库中执行如下sql

SELECT VERSION(), @@sql_mode;

2、关闭ONLY_FULL_GROUP_BY的规则校验，关闭规则校验需要执行如下sql。以下两个sql单引号中的内容是第一步查询的结果去掉“ONLY_FULL_GROUP_BY,”之后的值

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';
SET SESSION sql_mode='STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION';