SELF_BEFORE_AFTER - 为什么不返回相关级别的成员？

Question

这是我的剧本：

WITH 
    SET [Set_TargetEmp] AS
        {
        FILTER(
            [Employee Department].AllMembers,
                (
                InStr(
                    1, 
                    [Employee].[Employee Department].currentmember.name, 
                    "REUBEN") <> 0
                ) 
            )
        }
SELECT
    DESCENDANTS(
        [Set_TargetEmp],
        [Employee].[Employee Department],
        SELF_BEFORE_AFTER)
    ON 1,
    {} ON 0
FROM [Adventure Works] 

我知道[Set_TargetEmp]如下：

那么为什么当我将它包含在带有可选arg DESCENDANTS的函数SELF_BEFORE_AFTER中时，不是reuben的相关部门和标题没有返回？

---

修改

所以我进一步简化了上述内容。为什么下面没有返回Reuben的标题和部门 - 我认为SELF_BEFORE_AFTER的意思是还要从层次结构[Employee].[Employee Department]的其他级别返回亲属？

SELECT
    DESCENDANTS(
        [Employee].[Employee Department].[Employee].[Reuben H. D'sa],
        [Employee].[Employee Department],
        SELF_BEFORE_AFTER)
    ON 1,
    {} ON 0
FROM [Adventure Works] 

Answer 1

Descendants只返回后代，i。即比第一个参数更低级别的成员。你需要的是Ancestor。但是 - 根据文档 - Ancestor和Ancestors函数不允许set作为第一个参数。这意味着 - 假设您的集合可能包含多个成员 - 您必须使用Generate来迭代[Set_TargetEmp]的成员：

WITH 
    SET [Set_TargetEmp] AS
        {
        FILTER(
            [Employee Department].AllMembers,
                (
                InStr(
                    1, 
                    [Employee].[Employee Department].currentmember.name, 
                    "REUBEN") <> 0
                ) 
            )
        }
SELECT
    {} ON 0,
    Generate([Set_TargetEmp] as e,
             {Ancestor(e.Current, [Employee].[Employee Department].[Department])}
            )
    ON 1
FROM [Adventure Works]