Question

我有这个MS-SQL查询，在数据库中有数千行记录：

SELECT DISTINCT TOP 7 DATENAME(MM, mydatetime) + ' ' + CAST(DAY(mydatetime) AS VARCHAR(2)) as thedate
    , MONTH(mydatetime)
    , DAY(mydatetime)
    , COUNT(Page) as totalcount
    , count(DISTINCT Page) as visitors
  FROM someTable
  WHERE Page LIKE '%AEC%'
  GROUP BY DATENAME(MM, mydatetime) + ' ' + CAST(DAY(mydatetime) AS VARCHAR(2))
    , MONTH(mydatetime)
    , DAY(mydatetime)
  ORDER BY MONTH(mydatetime) DESC
    , DAY(mydatetime) DESC

输出：

thedate     | totalcount | visitors
-----------------------------------
October 17  |     4      |    1
October 15  |     1      |    1
October 12  |     1      |    1
October 3   |     3      |    3
October 2   |     42     |    22
September 28|     2      |    1
September 21|     14     |    10

我的问题是我不能按降序输出，所以看起来像这样：

thedate     | totalcount | visitors
-----------------------------------
September 21|     14     |    10
September 28|     2      |    1
October 2   |     42     |    22
October 3   |     3      |    3
October 12  |     1      |    1
October 15  |     1      |    1
October 17  |     4      |    1

所以非常感谢任何帮助。

Answer 1

根据您的实际需求，您可以将当前查询用作派生表，并按照您希望的方式进行排序：

SELECT *
FROM (  SELECT DISTINCT TOP 7 DATENAME(mm, mydatetime) + ' ' 
                              + CAST(DAY(mydatetime) AS VARCHAR(2)) AS thedate, 
                              MONTH(mydatetime)                     AS theMonth, 
                              DAY(mydatetime)                       AS theDay, 
                              COUNT(page)                           AS totalcount, 
                              COUNT(DISTINCT page)                  AS visitors 
        FROM   sometable 
        WHERE  page LIKE '%AEC%' 
        GROUP  BY DATENAME(mm, mydatetime) + ' ' 
                  + CAST(DAY(mydatetime) AS VARCHAR(2)), 
                  MONTH(mydatetime), 
                  DAY(mydatetime) 
        ORDER  BY MONTH(mydatetime) DESC, 
                  DAY(mydatetime) DESC) A
ORDER BY theMonth, theDay

Answer 2

您需要从ORDER BY子句中删除DESC。由于DESC，您的结果完全相反！

Answer 3

要获取您指定的订单（仅包括退货结果中所需的日期），您需要删除desc并在where子句中添加日期过滤器。

如果您的过滤器正确使用，这也可以让您摆脱最高级的陈述。

SELECT DISTINCT TOP 7 DATENAME(MM, mydatetime) 
    + ' ' + CAST(DAY(mydatetime) AS VARCHAR(2)) as thedate
    , MONTH(mydatetime)
    , DAY(mydatetime)
    , COUNT(Page) as totalcount
    , count(DISTINCT Page) as visitors
  FROM someTable
  WHERE Page LIKE '%AEC%' 
    AND /* filter date range i.e. MONTH(mydatetime) > 9 AND YEAR(mydatetime) > 2011 */
  GROUP BY DATENAME(MM, mydatetime) + ' ' + CAST(DAY(mydatetime) AS VARCHAR(2))
    , MONTH(mydatetime)
    , DAY(mydatetime)
  ORDER BY MONTH(mydatetime) 
    , DAY(mydatetime)

MS-SQL排序输出按降序排列

3 个答案: