Reporting services 固定矩阵宽度

在努力完成这一目标后，我的问题是：

在SSR2008中，我使用了一个矩阵，其中包含选定月份的列组。第一列是所选的第一个月，也是新表启动后的十二个月：

Month | Mar11 May11 Apr11 Jun11 Jul11 Aug11 Sep11 Oct11 Nov11 Dec11 Jan12 Feb12
------+------------------------------------------------------------------------
Cat.1 |   3     4      5    7     8     9     1     3
Cat.2 |   4     2      3    6     1     3     2     5

Month | Mar12 May12 Apr12
------+------------------------------------------------------------------------
Cat.1 |   3     2     1
Cat.2 |   4     1     7

这就提供了一个整洁的表格，当表格“重复”（用一个大的行组模拟）时，表格将整齐地显示在整个宽度上。但是，如果只选择一个月，则布局太窄，看起来相当蹩脚：

Month | Mar
------+----
Cat.1 |  3

---

如何创建具有固定宽度（即12列宽度）的矩阵，而不考虑选择了多少个月？

有两种方法可以做到这一点：

使用不同的行和列分组值在查询中创建笛卡尔框架

SELECT
 C.MonthStarting
,R.Category
,D.InstanceCount

FROM ( -- column values
    SELECT DISTINCT MonthStarting
    FROM Calendar
    WHERE MonthStarting BETWEEN @StartDate AND @EndDate
) AS AS C

JOIN ( -- row values
    SELECT DISTINCT Category
    FROM SomeRelevantTables
) AS R
    ON 1 = 1 -- intentional cartesian product

LEFT JOIN (
    SELECT 
     Category
    ,MonthStarting
    ,COUNT(1) AS InstanceCount

    FROM SomeRelevantTables

    GROUP BY
         Category
        ,MonthStarting
) AS D
    ON C.MonthStarting = D.MonthStarting
    AND R.Category = D.Category

或者，您可以在查询中透视列而不是布局，并在表中而不是矩阵中显示数据

SELECT 
 T.Category
,SUM(CASE WHEN C.RowNumberAsc = 1 THEN 1 END) AS Column1
,SUM(CASE WHEN C.RowNumberAsc = 2 THEN 1 END) AS Column2
,SUM(CASE WHEN C.RowNumberAsc = 3 THEN 1 END) AS Column3
,SUM(CASE WHEN C.RowNumberAsc = 4 THEN 1 END) AS Column4

FROM SomeRelevantTables AS T

JOIN (
    SELECT
     C.*
    ,ROW_NUMBER()OVER(PARTITION BY MonthStarting) AS RowNumberAsc

    FROM (
        SELECT DISTINCT MonthStarting
        FROM Calendar
        WHERE MonthStarting BETWEEN @StartDate AND @EndDate
    ) AS C
) AS C
    ON T.MonthStarting = C.MonthStarting

GROUP BY
    T.Category