在Sql Server 2008中Order by子句不起作用

Question

我已经查询

SELECT Datename(MM, CONVERT(DATE, created_date))           AS open_date, 
       Count(Datename(MONTH, CONVERT(DATE, created_date))) AS created_request 
FROM   usm_request 
WHERE  Datename(YEAR, CONVERT(DATE, created_date)) = Datename(YEAR, Getdate()) 
GROUP  BY Datename(MM, CONVERT(DATE, created_date)) 
ORDER  BY Datename(MM, CONVERT(DATE, created_date)) ASC 

并得到结果

 open_date  created_request

   April          4
   February      194
   January       540
   March         186

但是我们需要结果

  open_date  created_request

   January       540
   February      194
   March         186    
   April          4

请帮我。

问候

潘卡伊

Answer 1

DATENAME返回的字符串不是日期时间，因此按字典顺序排序。

您可以使用：

SELECT Datename(MM, CONVERT(DATE, created_date))           AS open_date, 
       Count(Datename(MONTH, CONVERT(DATE, created_date))) AS created_request 
FROM   usm_request 
WHERE  Datename(YEAR, CONVERT(DATE, created_date)) = Datename(YEAR, Getdate()) 
GROUP  BY  DATENAME(mm,created_date),
       DATEPART(yy, created_date), 
       DATEPART(mm, created_date)
ORDER  BY DATEPART(yy, created_date),
          DATEPART(mm, created_date)

...按年+月排序（如int ）。 您还必须将它们包括在GROUP BY 。

但是，为什么将datetime列始终转换为Date ？ 像DATENAME这样的方法似乎是多余的。 所以我在GROUP BY和ORDER BY省略了它。

Answer 2

您的ORDER BY子句收到一个字符串：月份的名称。 这就是为什么行按字母顺序排序。

尝试按实际日期表示进行订购：

ORDER BY CONVERT(DATE, created_date) ASC

Answer 3

SELECT * FROM(
SELECT Datename(MM, CONVERT(DATE, created_date))           AS open_date, 
       Count(Datename(MONTH, CONVERT(DATE, created_date))) AS created_request 
FROM   usm_request 
WHERE  Datename(YEAR, CONVERT(DATE, created_date)) = Datename(YEAR, Getdate()) 
GROUP  BY Datename(MM, CONVERT(DATE, created_date)) 
) a
ORDER  BY a.created_request desc