Question

我正在尝试在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

它给了我错误：

Invalid column name 'Joinning'.

分页需要'rownumber'。

有人可以建议我如何使用生成的rownumber对加入别名进行排序？

- 可能的解决方法

刚刚找到了解决方法;如果出现任何问题或需要更改，请提出建议：

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

   FROM  Employees
   WHERE  Region IS NOT NULL
   ) r

- 在行号上放置更多where子句（我想为分页做什么）：

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

希望你加入你的桌子。 order by子句通常在查询的最后一个给出，如下所示：

SELECT * FROM（ SELECT DISTINCT ROW_NUMBER（）rownum， LastName，Country，HireDate AS Joinning）来自员工 WHERE Region IS NOT NULL ORDER BY Joinning DESC）

希望这能帮到你！

Answer 3

使用该字段的原始名称，即可正常使用 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

按列别名运行Order

3 个答案: