Question

我正在尝试按某些人群对数据进行排序。我的数据看起来像：

Origional_Date  ID      FORM    Total
2012-03-01      1855    3       1283
2012-03-01      2869    4       2306
2012-03-01      5555    4       6440
2012-03-01      5555    3       8373
2012-03-01      2527    3       8476
2012-03-01      922     3       823
2012-03-15      2907    4       1420
2012-03-15      5555    3       2892
2012-03-15      2914    4       5008
2012-03-15      2375    3       4594

我到目前为止的查询是：

DECLARE @StartDate smalldatetime, @EndDate smalldatetime, @Web_ID as smallint
    SET @StartDate = '20120301'
    SET @EndDate = '20120331'
    SET @Web_ID = '5555'

SELECT DATEADD(WEEK, DATEDIFF(WEEK, 0, [Origional_Date]), -1) as [Origional_Date]
  ,[ID]
  ,[Form]
  ,SUM([Total]) as [Total]
  FROM mytable
  WHERE [Origional_Date] between @StartDate and @EndDate
    AND [ID] = @Web_ID
  GROUP BY DATEADD(WEEK, DATEDIFF(WEEK, 0, [Origional_Date]), -1), [ID], [Form]
  ORDER BY [Origional_Date], [Form] ASC

我要做的是显示我的数据：

Origional_Date  ID      FORM    Total
2012-03-01      Web     3       8373
2012-03-01      Direct  3       10582
2012-03-01      Web     4       6440
2012-03-01      Direct  4       2306
2012-03-15      WEB     3       2892
2012-03-15      Direct  3       4594
2012-03-15      Direct  4       6428

其中Web为ID 5555，Direct为其他任何内容。

我只是不确定如果可以使用“IF”语句完成此操作，或者是否需要在“group by”中完成

谢谢！

Answer 1

您可以使用案例陈述来实现这一目标。

像

SELECT DATEADD(WEEK, DATEDIFF(WEEK, 0, [Origional_Date]), -1) as [Origional_Date]
  ,(CASE WHEN [ID] = 5555 THEN 'Web' ELSE 'Direct' END )
  ,[Form]
  ,SUM([Total]) as [Total]
  FROM mytable
  WHERE [Origional_Date] between @StartDate and @EndDate
    AND [ID] = @Web_ID
  GROUP BY DATEADD(WEEK, DATEDIFF(WEEK, 0, [Origional_Date]), -1), (CASE WHEN [ID] = 5555 THEN 'Web' ELSE 'Direct' END ), [Form]
  ORDER BY [Origional_Date], [Form] ASC

Answer 2

使用Case clausule

select case active
    when 1 then 'Active'
    when 0 then 'Inactive'
    end         
from contract

在你的情况下，

与此类似：

select case [ID]
    when 5555 then 'Web'
    else 'Direct'
    end as [ID]
from mytable

在SQL Server中对查询帮助进行分组

2 个答案: