MDX 用Ancestors得到Hierarchy中指定Level的值（附带SCOPE用法之一）

需求：用户想要用Excel，对比每月预算和整年预算，需要在两个的Hierarchy浏览时显示同一个值。财年季月日(FYQMD)和财年月日(FYMD)。

自定义hierarchy

属性关系(Attribute Relationships)

下面我们用Ancestors来拿到当前member所在Hierarchy对应的Financial Year。

CREATE MEMBER CURRENTCUBE.MEASURES.[Full Year Budget] AS NULL;

SCOPE(MEASURES.[Full Year Budget]);
    THIS = SUM(
                Ancestors([Posting Date].[Date FYMD].CURRENTMEMBER, [Posting Date].[Date FYMD].[Financial Year]),
                [Measures].[Budget]);
END SCOPE;

这里Ancestors的第二个参数指定了要得到当前member所在Hierarchy的[Financial Year] level的值。

得到以下结果：

Budget是用户输入的Amount的SUM。

为了让两个维度显示同一个Measure，这里用到了Scope语句，这个东东，就像DAX里面的CALCULATE一样的牛牪犇！！！

先弄两个隐藏的Measure：

--99 - Full Year Budget FYMD
CREATE MEMBER CURRENTCUBE.MEASURES.[99 - Full Year Budget FYMD] AS NULL, DISPLAY_FOLDER = ‘Budget Full Year‘                                  ,  ASSOCIATED_MEASURE_GROUP = ‘Finance Budget Transactions‘,VISIBLE = 0; 

SCOPE(MEASURES.[99 - Full Year Budget FYMD]);
    THIS = SUM(
                Ancestors([Posting Date].[Date FYMD].CURRENTMEMBER, [Posting Date].[Date FYMD].[Financial Year]),
                [Measures].[Budget]);
         BACK_COLOR(THIS) = RGB(247,252,185); --light yellow
END SCOPE;

--99 - Full Year Budget FYQMD
CREATE MEMBER CURRENTCUBE.MEASURES.[99 - Full Year Budget FYQMD] AS NULL, DISPLAY_FOLDER = ‘Budget Full Year‘                                  ,  ASSOCIATED_MEASURE_GROUP = ‘Finance Budget Transactions‘,VISIBLE = 0; 

SCOPE(MEASURES.[99 - Full Year Budget FYQMD]);
    THIS = SUM(
                Ancestors([Posting Date].[Date FYQMD].CURRENTMEMBER, [Posting Date].[Date FYQMD].[Financial Year]),
                [Measures].[Budget]);
         BACK_COLOR(THIS) = RGB(247,252,79); --79
END SCOPE;

再用Scope把它们包起来，显示为[Full Year Budget]：

--Full Year Budget
CREATE MEMBER CURRENTCUBE.MEASURES.[Full Year Budget] AS NULL, DISPLAY_FOLDER = ‘Budget Full Year‘,                                       ASSOCIATED_MEASURE_GROUP = ‘Finance Budget Transactions‘,VISIBLE = 1; 

SCOPE(MEASURES.[Full Year Budget]);

    --Fiscal YTD FYQMD
    SCOPE([Posting Date].[Date FYQMD].[Financial Year].MEMBERS);
         THIS = Measures.[99 - Full Year Budget FYQMD];
    END SCOPE;

    SCOPE([Posting Date].[Date FYQMD].[Quarter].MEMBERS);
        THIS = Measures.[99 - Full Year Budget FYQMD];
    END SCOPE;

    SCOPE([Posting Date].[Date FYQMD].[Month].MEMBERS);
        THIS = Measures.[99 - Full Year Budget FYQMD];
    END SCOPE;

    SCOPE([Posting Date].[Date FYQMD].[Day].MEMBERS);
        THIS = NULL;
    END SCOPE; 

    --Fiscal YTD FYMD
    SCOPE([Posting Date].[Date FYMD].[Financial Year].MEMBERS);
        THIS = Measures.[99 - Full Year Budget FYMD];
    END SCOPE;

    SCOPE([Posting Date].[Date FYMD].[Month].MEMBERS);
        THIS = Measures.[99 - Full Year Budget FYMD];
    END SCOPE; 

    SCOPE([Posting Date].[Date FYMD].[Day].MEMBERS);
        THIS = NULL;
    END SCOPE;
END SCOPE;

最终得到结果如下：

左边是FYQMD，右边是FYMD。（可以看到右边的Budget YTD没有用Scope这个trick--基于FYQMD建的Measure，没有显示正确，坏了，哈哈。）

基于上面可以定义各种variance，和variance %。

例子：https://www.purplefrogsystems.com/blog/2010/08/calculate-run-rate-full-year-projection-in-mdx/

http://stackoverflow.com/questions/16545745/mdx-calculate-sum-at-a-fixed-level-in-hierarchy

https://bidrone.wordpress.com/2013/04/25/mdx-ancestorsumytd-function-target-calculation-for-different-time-levels/