Convert LastNotEmpty Query to Member - sql-server

Question

I would like to report the state of data availability resp. the max date specific measure(groups) have data loaded. This is a functionality I would then try to incorporate into each report. In theory each measure could have another "last member with data" in the date dimension however it is OK for the moment to simplify that to one measure per measure group or the max for the whole measure group.
I have written an MDX query which gives me the relevant answer. However to leverage easier maintenance I am striving to incorporate that information as a calculated member into the cube itself. Using MDX only every leap year or so I did not successfully manage to convert the query into a calculated member definition.
// Repro-Query on Adventure Works
// with Adventure Works 2012 EE result should be "July 31, 2008"
// contrasted to last date in date dimension which is "December 31,2010
WITH Member [Measures].[Data Availability] AS
[Date].[Calendar].CurrentMember.Name
SELECT
{
[Measures].[Data Availability]
} ON COLUMNS
FROM
[Adventure Works]
WHERE
{
TAIL(
FILTER
(
[Date].[Date].Members,
[Measures].[Internet Sales Amount] >0
)
,1
)
}
Result shoud be the same as in the query but encapsulated within one calculated measure statement. Remember I don't need the value of the measure but just the name of the last dimension element with data in the date dimension.
Regarding code it should be something like this:
WITH Member [Measures].[Data Availability] AS
<your great translation to a member >
SELECT
{
[Measures].[Data Availability]
} ON COLUMNS
FROM
[Adventure Works]
Feel free to suggest different approaches to get the answer to the problem like better performing ways to calculate the last member with data.

Answer 1

Thanks for the great question and for using Adventure Works. Despite what some commenters say, that’s a great way to get an answer here.
Try this. The Tail function returns a set so .Item(0).Item(0) turns it into a member by choosing the first tuple and first member.
WITH Member [Measures].[Data Availability] AS
TAIL(
FILTER
(
[Date].[Date].Members,
[Measures].[Internet Sales Amount] >0
)
,1
).Item(0).Item(0).Name
SELECT
{
[Measures].[Data Availability]
} ON COLUMNS
FROM
[Adventure Works]