MDX Count with a Filter? - filter

Question

We want to count the weeks where "Inventory Units" were greater then 0.
I have put this together but it doesn't quite work, it counts all weeks for an item not just the ones where Inventory > 0. I have tried some filters but they always result in #error as the result
WITH
SET [PreviousSixWeeks] AS
Tail
(
Filter
(
[Time].[Yr-Qtr-Per-Wk-Day].[Fiscal Week]
,
[Measures].[Inventory Units] > 0
)
,6
)
MEMBER [Measures].[INVWeekCount] AS
DistinctCount(PreviousSixWeeks*[Measures].[Inventory Units]*[Item].[Item Code])
SELECT
{[Measures].[INVWeekCount]} ON COLUMNS
,{[Item].[Item Code].[Item Code]} ON ROWS
FROM
(
SELECT
{[Location].[Location].&[64]} ON COLUMNS
FROM
(
SELECT
{
[Time].[Yr-Qtr-Per-Wk-Day].[Fiscal Year].&[2016].&[1].&[2].&[8]
,[Time].[Yr-Qtr-Per-Wk-Day].[Fiscal Year].&[2016].&[1].&[2].&[9]
,[Time].[Yr-Qtr-Per-Wk-Day].[Fiscal Year].&[2016].&[1].&[3].&[10]
,[Time].[Yr-Qtr-Per-Wk-Day].[Fiscal Year].&[2016].&[1].&[3].&[11]
,[Time].[Yr-Qtr-Per-Wk-Day].[Fiscal Year].&[2016].&[1].&[3].&[12]
,[Time].[Yr-Qtr-Per-Wk-Day].[Fiscal Year].&[2016].&[1].&[3].&[13]
} ON COLUMNS
FROM [RFP]
)
);

Answer 1

Try this to count weeks with inventory, make sure it returns desired results then add any filters you want.
WITH MEMBER [Measures].[InvWeekCount] AS
FILTER([Time].[Yr-Qtr-Per-Wk-Day].[Fiscal Week].MEMBERS,
[Measures].[Inventory Units]>0).COUNT
SELECT [Measures].[InvWeekCount] ON COLUMNS,
[Item].[Item Code].[Item Code].MEMBERS ON ROWS
FROM [Test Cube]

Answer 2

Better to avoid Filter if you can as its performance is not great:
WITH
SET [PreviousSixWeeks] AS
Tail
(
[Time].[Yr-Qtr-Per-Wk-Day].[Fiscal Week].MEMBERS
,6
)
MEMBER [Measures].[INVWeekCount] AS
Count(NonEmpty((EXISTING PreviousSixWeeks),[Measures].[Inventory Units]))
SELECT
{[Measures].[INVWeekCount]} ON COLUMNS
,{[Item].[Item Code].[Item Code]} ON ROWS
FROM
(
SELECT
{[Location].[Location].&[64]} ON COLUMNS
FROM
(
SELECT
{
[Time].[Yr-Qtr-Per-Wk-Day].[Fiscal Year].&[2016].&[1].&[2].&[8]
,[Time].[Yr-Qtr-Per-Wk-Day].[Fiscal Year].&[2016].&[1].&[2].&[9]
,[Time].[Yr-Qtr-Per-Wk-Day].[Fiscal Year].&[2016].&[1].&[3].&[10]
,[Time].[Yr-Qtr-Per-Wk-Day].[Fiscal Year].&[2016].&[1].&[3].&[11]
,[Time].[Yr-Qtr-Per-Wk-Day].[Fiscal Year].&[2016].&[1].&[3].&[12]
,[Time].[Yr-Qtr-Per-Wk-Day].[Fiscal Year].&[2016].&[1].&[3].&[13]
} ON COLUMNS
FROM [RFP]
)
);
But this is a better way of doing Count with a filter criterion - it performs a lot better:
WITH
MEMBER [Measures].[InvWeekCount] AS
Sum
(
Time.[Yr-Qtr-Per-Wk-Day].[Fiscal Week].MEMBERS
,IIF
(
(NOT
IsEmpty([Measures].[Inventory Units]))
,1
,0
)
)
SELECT
[Measures].[InvWeekCount] ON COLUMNS
,[Item].[Item Code].[Item Code].MEMBERS ON ROWS
FROM
(
SELECT
{[Location].[Location].&[64]} ON COLUMNS
FROM
(
SELECT
{
[Time].[Yr-Qtr-Per-Wk-Day].[Fiscal Year].&[2016].&[1].&[2].&[8]
,[Time].[Yr-Qtr-Per-Wk-Day].[Fiscal Year].&[2016].&[1].&[2].&[9]
,[Time].[Yr-Qtr-Per-Wk-Day].[Fiscal Year].&[2016].&[1].&[3].&[10]
,[Time].[Yr-Qtr-Per-Wk-Day].[Fiscal Year].&[2016].&[1].&[3].&[11]
,[Time].[Yr-Qtr-Per-Wk-Day].[Fiscal Year].&[2016].&[1].&[3].&[12]
,[Time].[Yr-Qtr-Per-Wk-Day].[Fiscal Year].&[2016].&[1].&[3].&[13]
} ON COLUMNS
FROM [RFP]
)
);
note
in terms of simple AdvWrks code this is what you're using:
WITH
MEMBER [Measures].[InvWeekCount] AS
Filter
(
[Product].[Product].[Product]
,
[Measures].[Internet Order Quantity] > 0
).Count
SELECT
[Measures].[InvWeekCount] ON COLUMNS
,[Customer].[Customer Geography].[Country] ON ROWS
FROM [Adventure Works];
But this is the recommended efficient method:
WITH
MEMBER [Measures].[InvWeekCount] AS
Sum
(
[Product].[Product].[Product]
,IIF
(
(NOT
IsEmpty([Measures].[Internet Order Quantity]))
,1
,NULL
)
)
SELECT
[Measures].[InvWeekCount] ON COLUMNS
,[Customer].[Customer Geography].[Country] ON ROWS
FROM [Adventure Works];