按列别名运行顺序

Question

我试图在Northwind数据库上运行以下SQL查询：

SELECT * FROM (
    SELECT DISTINCT ROW_NUMBER() OVER (ORDER BY Joinning DESC) rownum,
    LastName, Country, HireDate AS Joinning
   FROM  Employees
   WHERE  Region IS NOT NULL
   ) r

这给了我错误：

Invalid column name 'Joinning'.

分页需要“行号”。

有人可以建议我如何根据生成的行号对Joining别名进行排序吗？

-可能的解决方法

只是想出一个解决办法； 请提出任何错误或需要更改的建议：

SELECT ROW_NUMBER() OVER (ORDER BY Joinning DESC) rownum,* FROM (
    SELECT  
    LastName, Country, HireDate AS Joinning

   FROM  Employees
   WHERE  Region IS NOT NULL
   ) r

-在行号上进一步放置where子句（我想为分页做些什么）：

With myres as(
   SELECT ROW_NUMBER() OVER (ORDER BY Joinning DESC) rownum,* FROM (
    SELECT  
       LastName, Country, HireDate AS Joinning
       FROM  Employees
       WHERE  Region IS NOT NULL
     ) a
) Select * from myres where myres.rownum > 0 and myres.rownum < = 0+20

Answer 1

尝试

SELECT * FROM (
SELECT DISTINCT ROW_NUMBER() OVER (ORDER BY HireDate DESC) rownum,
LastName, Country, HireDate AS Joinning
FROM  Employees
WHERE  Region IS NOT NULL
) r

Answer 2

希望你能加入你的餐桌。 通常在查询的最后给出order by子句，如下所示：

SELECT * FROM（SELECT DISTINCT ROW_NUMBER（）rownum，LastName，Country，HireDate AS Joining）从员工所在区域不为空的ORDER BY BY DESC

希望这对您有所帮助！

Answer 3

使用该字段的原始名称，将可以正常使用 HireDate

SELECT * FROM (
    SELECT DISTINCT ROW_NUMBER() OVER (ORDER BY HireDate DESC) rownum,
    LastName, Country, HireDate AS Joinning
   FROM  Employees
   WHERE  Region IS NOT NULL
   ) r