Question

我的SQL查询是：

SELECT DISTINCT
   SUBSTRING(DATENAME(MONTH, PostDate), 1, 3) + '-' + CAST(YEAR(PostDate) AS VARCHAR(4)) AS PostArchive,
   Posts = COUNT(*) 
FROM    
   Post  WHERE Verified=1 
GROUP BY
   SUBSTRING(DATENAME(MONTH, PostDate), 1, 3) + '-' + CAST(YEAR(PostDate) AS VARCHAR(4)),
   YEAR(PostDate), MONTH(PostDate)

 ORDER BY PostArchive

它给出了这样的结果：

PostArchive    Posts
------------------------
Mar-2009    1
Mar-2010    1
May-2005    1
May-2011    1
May-2012    1
May-2013    1

但是我希望按照日期（年）的顺序排列结果。

PostArchive    Posts
------------------------
May-2005    1
Mar-2009    1
Mar-2010    1
May-2011    1
May-2012    1
May-2013    1

我搜索并找到this链接，但无法解决我的问题。

我试试：

ORDER BY CONVERT(DateTime, PostArchive,101)  DESC

但它给了我一个错误：

Invalid column name 'PostArchive'.

有没有办法做到这一点，或者我做错了。谢谢。

Answer 1

错误的原因是PostArchive是您给SELECT行上的列赋予的名称，它实际上是查询的输出。 ORDER BY子句没有查看它，它查看了它对查询的输入，在本例中是PostDate

Answer 2

我认为你并不是故意想要订购它一年，而是年/月。你有的订购问题是因为你把它当作一个角色而不是一个约会。
您不需要DISTINCT，因为您已经是GROUP BY。
主要问题是您已经转换为VARCHAR。因此，几个月是不合格的。

SSSS

-- Create a CTE (inline view)

WITH T AS (
SELECT YEAR(PostDate) PostYear
     , MONTH(PostDate) PostMM
     , SUBSTRING(DATENAME(MONTH, PostDate),1,3) PostMonth
     , COUNT(*) Posts
  FROM Post
 WHERE Verified = 1
 GROUP BY YEAR(PostDate)
     , MONTH(PostDate)
     , DATENAME(MONTH, PostDate)
)
 -- Build you date string
SELECT PostMonth + '-' + CAST(PostYear AS VARCHAR(4)) AS PostArchive
     , Posts
  FROM T
   -- Sort it by the components separately
 ORDER BY PostYear
  -- Don't use the character, otherwise, Aug will come before Mar
     , PostMM

Answer 3

我使用CTE得到结果试试这个

with tempTable (PostArchiveMonth , PostArchiveYear , PostArchiveMonthName ,  Posts )
(
    select month(PostDate) , YEAR(PostDate) , SUBSTRING(DATENAME(MONTH, PostDate), 1, 3) 
           COUNT(*) 
    FROM Post  
    WHERE Verified=1 
    group by MONTH(PostDate) ,YEAR( PostDate)
    ,SUBSTRING(DATENAME(MONTH, PostDate), 1, 3) 
)

select PostArchiveMonthName +'-' + PostArchiveYear as PostArchive , Posts
from  tempTable 
order by PostArchiveYear  , PostArchiveMonth

Answer 4

尝试

SELECT DISTINCT
   SUBSTRING(DATENAME(MONTH, PostDate), 1, 3) + '-' + CAST(YEAR(PostDate) AS VARCHAR(4)) AS PostArchive,
   Posts = COUNT(*) 
FROM    
   Post  WHERE Verified=1 
GROUP BY
   SUBSTRING(DATENAME(MONTH, PostDate), 1, 3) + '-' + CAST(YEAR(PostDate) AS VARCHAR(4)),
   YEAR(PostDate), MONTH(PostDate)
Order by Month(PostDate), Year(PostDate)

Answer 5

尝试改变这一点：

ORDER BY PostArchive

......对此...

ORDER BY YEAR(PostDate)

在发布日期按年份排序

5 个答案: