mdx - MDX SUM 函数和 NULL 值

Question

我正在尝试使用基础 SQL Server 2008 Analysis Services 数据库为 Team Foundation Server 2010 创建一些报告。多维数据集“团队系统”是随 TFS 2010 报告一起提供的。

我的问题是。我尝试使用 FactWorkItemHistory 的 StateChangeCount 度量。在某些时间段内，工作项状态没有变化，但有其他变化。因此，我们有一些事实行具有 NULL StateChangeCount，如下所述。

即使基础事实行包含 NULL 值，State Change Count 度量有时也会产生 0 值。此度量定义为 [FactWorkItemHistory].[StateChangeCount] 上的 SUM。NULLS 的 SUM 返回 0 是设计使然还是我遗漏了什么？有问题的时期是 2013-03-01（3 月）和 2013-05-02（5 月）。

SELECT
  [DateSK],
  COUNT(*) AS COUNT,
  SUM([StateChangeCount]) AS SUM
FROM
      [Tfs_Warehouse].[dbo].[FactWorkItemHistory]
WHERE
      [WorkItemSK] IN (SELECT [WorkItemSK] FROM [Tfs_Warehouse].[dbo].[DimWorkItem]     WHERE [System_WorkItemType] = 'Bug')
GROUP BY
  [DateSK]

输出是：

DateSK                  COUNT SUM
---------------------------------------
2011-05-05 00:00:00.000 13    7
2012-03-01 00:00:00.000 2     NULL
2012-09-28 00:00:00.000 60    2
2013-05-02 00:00:00.000 16    NULL
2013-05-06 00:00:00.000 9     9

查询：

SELECT
  [DateSK],
  [StateChangeCount]
FROM
      [Tfs_Warehouse].[dbo].[FactWorkItemHistory]
WHERE
      [WorkItemSK] IN (SELECT [WorkItemSK] FROM [Tfs_Warehouse].[dbo].[DimWorkItem] WHERE [System_WorkItemType] = 'Bug')
ORDER BY   
      [DateSK]

给出：

DateSK                  StateChangeCount
---------------------------------------
2011-05-05 00:00:00.000 1
2011-05-05 00:00:00.000 NULL
2011-05-05 00:00:00.000 NULL
2011-05-05 00:00:00.000 1
2011-05-05 00:00:00.000 NULL
2011-05-05 00:00:00.000 1
2011-05-05 00:00:00.000 NULL
2011-05-05 00:00:00.000 1
2011-05-05 00:00:00.000 NULL
2011-05-05 00:00:00.000 1
2011-05-05 00:00:00.000 NULL
2011-05-05 00:00:00.000 1
2011-05-05 00:00:00.000 1
2012-03-01 00:00:00.000 NULL
2012-03-01 00:00:00.000 NULL
2012-09-28 00:00:00.000 1
2012-09-28 00:00:00.000 NULL
2012-09-28 00:00:00.000 NULL
2012-09-28 00:00:00.000 NULL
2012-09-28 00:00:00.000 NULL
2012-09-28 00:00:00.000 NULL
2012-09-28 00:00:00.000 NULL
2012-09-28 00:00:00.000 NULL
2012-09-28 00:00:00.000 NULL
2012-09-28 00:00:00.000 NULL
2012-09-28 00:00:00.000 NULL
2012-09-28 00:00:00.000 NULL
2012-09-28 00:00:00.000 NULL
2012-09-28 00:00:00.000 NULL
2012-09-28 00:00:00.000 NULL
2012-09-28 00:00:00.000 NULL
2012-09-28 00:00:00.000 NULL
2012-09-28 00:00:00.000 NULL
2012-09-28 00:00:00.000 NULL
2012-09-28 00:00:00.000 NULL
2012-09-28 00:00:00.000 NULL
2012-09-28 00:00:00.000 NULL
2012-09-28 00:00:00.000 NULL
2012-09-28 00:00:00.000 1
2012-09-28 00:00:00.000 NULL
2012-09-28 00:00:00.000 NULL
2012-09-28 00:00:00.000 NULL
2012-09-28 00:00:00.000 NULL
2012-09-28 00:00:00.000 NULL
2012-09-28 00:00:00.000 NULL
2012-09-28 00:00:00.000 NULL
2012-09-28 00:00:00.000 NULL
2012-09-28 00:00:00.000 NULL
2012-09-28 00:00:00.000 NULL
2012-09-28 00:00:00.000 NULL
2012-09-28 00:00:00.000 NULL
2012-09-28 00:00:00.000 NULL
2012-09-28 00:00:00.000 NULL
2012-09-28 00:00:00.000 NULL
2012-09-28 00:00:00.000 NULL
2012-09-28 00:00:00.000 NULL
2012-09-28 00:00:00.000 NULL
2012-09-28 00:00:00.000 NULL
2012-09-28 00:00:00.000 NULL
2012-09-28 00:00:00.000 NULL
2012-09-28 00:00:00.000 NULL
2012-09-28 00:00:00.000 NULL
2012-09-28 00:00:00.000 NULL
2012-09-28 00:00:00.000 NULL
2012-09-28 00:00:00.000 NULL
2012-09-28 00:00:00.000 NULL
2012-09-28 00:00:00.000 NULL
2012-09-28 00:00:00.000 NULL
2012-09-28 00:00:00.000 NULL
2012-09-28 00:00:00.000 NULL
2012-09-28 00:00:00.000 NULL
2012-09-28 00:00:00.000 NULL
2012-09-28 00:00:00.000 NULL
2012-09-28 00:00:00.000 NULL
2012-09-28 00:00:00.000 NULL
2013-05-02 00:00:00.000 NULL
2013-05-02 00:00:00.000 NULL
2013-05-02 00:00:00.000 NULL
2013-05-02 00:00:00.000 NULL
2013-05-02 00:00:00.000 NULL
2013-05-02 00:00:00.000 NULL
2013-05-02 00:00:00.000 NULL
2013-05-02 00:00:00.000 NULL
2013-05-02 00:00:00.000 NULL
2013-05-02 00:00:00.000 NULL
2013-05-02 00:00:00.000 NULL
2013-05-02 00:00:00.000 NULL
2013-05-02 00:00:00.000 NULL
2013-05-02 00:00:00.000 NULL
2013-05-02 00:00:00.000 NULL
2013-05-02 00:00:00.000 NULL
2013-05-06 00:00:00.000 1
2013-05-06 00:00:00.000 1
2013-05-06 00:00:00.000 1
2013-05-06 00:00:00.000 1
2013-05-06 00:00:00.000 1
2013-05-06 00:00:00.000 1
2013-05-06 00:00:00.000 1
2013-05-06 00:00:00.000 1
2013-05-06 00:00:00.000 1

最后是 MDX 查询：

SELECT
 NON EMPTY { [Measures].[State Change Count] } ON COLUMNS,
NON EMPTY { ([Date].[Date].[Date].ALLMEMBERS * [Work Item].[System_State].    [System_State].ALLMEMBERS ) }
ON ROWS FROM (
            SELECT (
                  { [Work Item].[System_WorkItemType].&[Bug] }
                       )
          ON COLUMNS FROM [Team System])
            WHERE ( [Work Item].[System_WorkItemType].&[Bug] )

结果是：

                              StateChangeCount
---------------------------------------------
2011-05-05  Assigned          4
2011-05-05  For verification  2
2011-05-05  In progress       1
2012-03-01  Assigned          0
2012-09-28  Assigned          2
2013-05-02  Assigned          0
2013-05-06  Assigned          9

尽管

SELECT
 NON EMPTY { [Measures].[State Change Count] } ON COLUMNS,
 NON EMPTY { ([Date].[Date].[Date].ALLMEMBERS * [Work Item].[System_State].    [System_State].ALLMEMBERS ) }
ON ROWS FROM (
        SELECT (
              { [Work Item].[System_WorkItemType].&[Bug] }
                   )
      ON COLUMNS FROM [Team System])
        WHERE ( [Work Item].[System_WorkItemType].&[Bug] )

是：

                 State Change Count
------------------------------------
May 2011          7
June 2011         (null)
July 2011         (null)
August 2011       (null)
September 2011    (null)
October 2011      (null)
November 2011     (null)
December 2011     (null)
January 2012      (null)
February 2012     (null)
March 2012        0
April 2012        (null)
May 2012          (null)
June 2012         (null)
July 2012         (null)
August 2012       (null)
September 2012    2
October 2012      (null)
November 2012     (null)
December 2012     (null)
January 2013      (null)
February 2013     (null)
March 2013        (null)
April 2013        (null)
May 2013          9
June 2013         (null)
July 2013         (null)
August 2013       (null)
Unknown           (null)

我可以看到，对于有问题的时期，有一些事实行，但包含其他工作项数据更改。我希望这些项目不应该污染结果，特别是对于 SUM。对于 COUNT，同意，看到零值很好，但对于 SUM 则不行。

任何帮助将不胜感激。

谢谢你

mdx - MDX SUM 函数和 NULL 值

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