MS SQL 2005 - 通过整理与子查询排序失败

时间:2010-11-03 11:59:27

标签: sql-server collate

这是显示问题的真实查询的简化版本。它可以在示例Adventureworks数据库上执行:

SELECT Person.Address.*,
 (SELECT TOP 1 [Name]
 FROM Person.StateProvince
 WHERE Person.StateProvince.StateProvinceId = Person.Address.StateProvinceId AND Person.StateProvince.TerritoryId IN (5, 6, 7)
 ORDER BY Person.StateProvince.TerritoryId) AS [Name]
FROM Person.Address
ORDER BY [Name]

这很好用,但我的问题是,如果我按字段添加排序规则,我会收到一条奇怪的错误消息:

SELECT Person.Address.*,
 (SELECT TOP 1 [Name]
 FROM Person.StateProvince
 WHERE Person.StateProvince.StateProvinceId = Person.Address.StateProvinceId AND Person.StateProvince.TerritoryId IN (5, 6, 7)
 ORDER BY Person.StateProvince.TerritoryId) AS [Name]
FROM Person.Address
ORDER BY [Name] COLLATE Chinese_PRC_CI_AI

错误是:

Msg 207, Level 16, State 1, Line 7
Invalid column name 'Name'.

如果没有子查询,使用collat​​e子句的查询效果很好,但是我需要它是这样的(出于一个复杂的原因,但请相信我:)。

是否有人知道此查询失败的原因,以及可能的解决方法是什么?这是一个错误吗?

谢谢! 亚当

1 个答案:

答案 0 :(得分:2)

SQL Server不允许您在order by子句中通过别名引用列。例如,这不起作用:

select id+1 as x from MyTable order by x

但您可以通过重复列定义来解决这个问题:

select id+1 as x from MyTable order by id+1

或者使用子查询:

select * from (select id+1 as x from MyTable) as subquery order by x

在您的情况下,最好的修复可能是使用子查询:

SELECT  *
FROM    (
        SELECT  Person.Address.*
        ,       (
                SELECT  TOP 1 [Name]
                FROM    Person.StateProvince
                WHERE   Person.StateProvince.StateProvinceId = 
                            Person.Address.StateProvinceId 
                        AND Person.StateProvince.TerritoryId IN (5, 6, 7)
                ORDER BY 
                        Person.StateProvince.TerritoryId
                ) AS [Name]
        FROM    Person.Address
        ) as SubqueryAlias
ORDER BY 
        [Name]