MDX计算每月会员

Question

我正在研究SSMS 2014中的一个查询，我需要[度量]。[Percent Unique App Users]按月计算，以便我可以动态计算月份的增加百分比。我最好喜欢从上个月到上个月的比较开始，这最终会最终以每个月的报告形式运行（因此需要它是动态的）。

有或没​​有我的DATE成员时，[CurrentMonthUniqueUsers]和[LastMonthUniqueUsers]的计数保持不变（以示例显示）。另外，如果没有我的WHERE语句，我只会得到非会员行的结果。

WITH 
MEMBER [LastMonthUniqueUsers] as SUM({[Date].[Calendar].CurrentMember.Lag(2)},[Measures].[App Unique Users Loggedin]) 
MEMBER [CurrentMonthUniqueUsers] as SUM({[Date].[Calendar].CurrentMember.Lag(1)},[Measures].[App Unique Users Loggedin]) 
// 
MEMBER [Measures].[Percent Unique App Users] AS ([CurrentMonthUniqueUsers])/([LastMonthUniqueUsers]), FORMAT_STRING = "Percent" 
// 
MEMBER [CurrentDate] As Now() 
// 

SELECT 
    non empty[Project].[Client Name].children ON 0, 
    non empty{[Measures].[Percent Unique App Users], 
     [CurrentMonthUniqueUsers], 
     [LastMonthUniqueUsers], 
     [Measures].[App Logins], 
     [Measures].[App Unique Users Loggedin]} ON 1 
FROM 
    [OpsViewWarehouse] 
WHERE 
    [Date].[Year].[2017] 

下面的图片是我得到的结果。登录次数和唯一登录次数始终保持不变，并且不会受到任何日期的过滤。

Data Screenshot

我新的MDX，所以任何帮助将不胜感激！

编辑（2017年5月22日）：这是查询与我whyTH提供的答案一起工作。请注意，它不是动态的，因为我必须在列上指定日期（201705）。

WITH 
    MEMBER [2MonthsPriorUniqueUsers] AS Sum({[Date].[Calendar Year Month].CurrentMember.Lag(2)},[Measures].[App Unique Users Loggedin]) 
    MEMBER [1MonthPriorUniqueUsers] AS Sum({[Date].[Calendar Year Month].CurrentMember.Lag(1)},[Measures].[App Unique Users Loggedin]) 
    MEMBER [1MonthPriorTotalAppLogins] AS Sum({[Date].[Calendar Year Month].CurrentMember.Lag(1)},[Measures].[App Logins]) 
    MEMBER [Measures].[PercentUniqueIncreaseMoM] AS ([1MonthPriorUniqueUsers]/[2MonthsPriorUniqueUsers])-1,FORMAT_STRING = "Percent" 
SELECT 
    NON EMPTY 
    {[Date].[Calendar Year Month].[201705]} 
    * [Project].[Client Name].members ON 0, 
    NON EMPTY 
    { 
     [Measures].[PercentUniqueIncreaseMoM] 
    ,[1MonthPriorUniqueUsers] 
    ,[2MonthsPriorUniqueUsers] 
    ,[1MonthPriorTotalAppLogins] 
    } ON 1 
FROM [OpsViewWarehouse] 

Answer 1

在查询您的CURRENTMEMBER是什么，是在WHERE子句中 - 这是2017年 - 因此这将不会再重返一个月 - 它可能返回成员[Date].[Calendar].[All]：

[Date].[Calendar].CurrentMember 

尝试增加个月后的任一SELECT或WHERE子句：

// 
WITH 
    MEMBER [LastMonthUniqueUsers] AS 
    Sum 
    (
     {[Date].[Calendar].CurrentMember.Lag(2)} 
    ,[Measures].[App Unique Users Loggedin] 
    ) 
    MEMBER [CurrentMonthUniqueUsers] AS 
    Sum 
    (
     {[Date].[Calendar].CurrentMember.Lag(1)} 
    ,[Measures].[App Unique Users Loggedin] 
    ) 
    // 
    MEMBER [Measures].[Percent Unique App Users] AS 
    [CurrentMonthUniqueUsers]/[LastMonthUniqueUsers] 
    ,FORMAT_STRING = "Percent" 
    // 
    MEMBER [CurrentDate] AS 
    Now() 
SELECT 
    NON EMPTY 
     [Project].[Client Name].Children ON 0 
,NON EMPTY 
    {[Date].[Calendar].[Month].&[Jan 2017]} //<<<<<<change to a month member in your cube 
    * { 
     [Measures].[Percent Unique App Users] 
    ,[CurrentMonthUniqueUsers] 
    ,[LastMonthUniqueUsers] 
    ,[Measures].[App Logins] 
    ,[Measures].[App Unique Users Loggedin] 
    } ON 1 
FROM [OpsViewWarehouse]; 

上面也可以是一组数月：

// 
WITH 
    MEMBER [LastMonthUniqueUsers] AS 
    Sum 
    (
     {[Date].[Calendar].CurrentMember.Lag(2)} 
    ,[Measures].[App Unique Users Loggedin] 
    ) 
    MEMBER [CurrentMonthUniqueUsers] AS 
    Sum 
    (
     {[Date].[Calendar].CurrentMember.Lag(1)} 
    ,[Measures].[App Unique Users Loggedin] 
    ) 
    // 
    MEMBER [Measures].[Percent Unique App Users] AS 
    [CurrentMonthUniqueUsers]/[LastMonthUniqueUsers] 
    ,FORMAT_STRING = "Percent" 
    // 
    MEMBER [CurrentDate] AS 
    Now() 
SELECT 
    NON EMPTY 
    { 
     [Measures].[Percent Unique App Users] 
    ,[CurrentMonthUniqueUsers] 
    ,[LastMonthUniqueUsers] 
    ,[Measures].[App Logins] 
    ,[Measures].[App Unique Users Loggedin] 
    } ON 0 
,NON EMPTY 
    {Date].[Calendar].[Month].MEMBERS //<<<<<<change to the month hierarchy in your cube 
    * [Project].[Client Name].Children ON 1 
FROM [OpsViewWarehouse];