Get The Previous Six Weeks in Query

Question

I have an MDX query that I'm using in an SSRS report. The report returns results for the current week beginning on Sunday. THe query takes three parameters: Year, Month, and Week. The year is defaulted to the curret year, the month is defaulted to the current
month, and the week is defaulted to the current week. Here is the MDX of the query:
SELECT
NON EMPTY
{[Measures].[Employee Hours]} ON COLUMNS
,NON EMPTY
[Employee].[Employee Discipline].[Employee Discipline].ALLMEMBERS*
[Employee].[Employee Department].[Employee Department].ALLMEMBERS*
[Employee].[Employee Full Name].[Employee Full Name].ALLMEMBERS*
[Employee Hours Time Category].[Utilization Category].[Utilization Category].ALLMEMBERS*
[Employee Hours Time Category].[Time Category].[Time Category].ALLMEMBERS*
[Project].[Client].[Client].ALLMEMBERS*
[Time].[Year].[Year].ALLMEMBERS*
[Time].[Month].[Month].ALLMEMBERS*
[Time].[Week].[Week].ALLMEMBERS
DIMENSION PROPERTIES
MEMBER_CAPTION
,MEMBER_UNIQUE_NAME
ON ROWS
FROM
SELECT
StrToSet
(@TimeWeek
,CONSTRAINED
) ON COLUMNS
FROM
SELECT
StrToSet
(@TimeMonth
,CONSTRAINED
) ON COLUMNS
FROM
SELECT
StrToSet
(@TimeYear
,CONSTRAINED
) ON COLUMNS
FROM
SELECT
StrToSet
(@EmployeeEmployeeDepartment
,CONSTRAINED
) ON COLUMNS
FROM
SELECT
StrToSet
(@EmployeeEmployeeDiscipline
,CONSTRAINED
) ON COLUMNS
FROM [OLSON BI]
CELL PROPERTIES
VALUE
,BACK_COLOR
,FORE_COLOR
,FORMATTED_VALUE
,FORMAT_STRING
,FONT_NAME
,FONT_SIZE
,FONT_FLAGS;
What I would like to do is return not just the current week, but also the previous five weeks.
IF there is an easier way to do this without having to pass the current year and the current month, that would be een better. I do have a time dimension called time which does have the [Time].[Week] member which is in the format of MM/DD/YYYY 00:00:00:00.
Any help would be greatly appreciated!
Thanks!!
A. M. Robinson

Answer 1

Your solution requires me to figure out what the week was six weeks ago. How is that accomplished? That is what the MDX is supposed to do. Take the current week (i.e., 8/31/2014) and go back six weeks.
In MDX you can do this for years, month, days, etc. It's fairly easy to say "give me the three previous years from the current year". I want the same thing for weeks.
I'm passing in a simple parameter for week: 8/31/2014 00:00:00. This is how it is formatted in the actual dimension table.
From what I've found, LastPeriods seems like the way to go...just trying to figure it out to work with my MDX. Take the current period and go back X number of periods.
SELECT LastPeriods(3,[Date].[Fiscal].[Fiscal Quarter].[Q4 FY 2002]) ON 0
FROM [Adventure Works]
A. M. Robinson