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Resolving a many-to-many requirement in SSAS2005

Resolving a many-to-many requirement in SSAS2005

Resolving a many-to-many requirement in SSAS2005


I will show the data table contents in the hope that someone will be able to help:

TRID  LCID      LTID  Measure
0001  0001  00010001  100
0001  0001  00010001  -50
0001  0003  00010003   20
0001  0003  00010003   10

...note that the LTID is a combination of the TRID and the LCID...

TRID  LCID  LTID     Status  CurrHist
0001  0001  00010001 NEW     HIST
0001  0002  00010002 RENEW   HIST
0001  0003  00010003 OTHER   CURR

0001  0001  00010001 31/01/2008
0001  0003  00010003 28/02/2008
0001  0003  00010003 31/03/2008
0001  0003  00010003 30/04/2008


Now the standard rules for the M2M relationships in SSAS2005 states that we link as follow:

Fact.LTID > DimTable.LTID
AsAtMonthEndSnapshot.LTID > DimTable.LTID
AsAtMonthEndSnapshot.DATE > AsAtMonthEndFlag.DATE

The Dimension usage is set up accordingly:

DimTable to Fact as a regular relationship type on LTID
DimTable to AsAtMonthEndSnapshot as a regular relationship type on LTID
DATE to Fact as a Many-to-many relationship using AsAtMonthEndSnapshot as the Intermediate measure group
DATE to AsAtMonthEndSnapshot as a regular relationship on DATE

The results in the browser is currently:

AsAtMonthEndFlag.DATE Measure
31/01/2008            50
28/02/2008            30
31/03/2008            30
30/04/2008            30
Total                 80

But the aim of the many-to-many (history) solution is to provide a snapshot as at a month end date, so the results should look like this:

AsAtMonthEndFlag.DATE Measure
31/01/2008            50
28/02/2008            70
31/03/2008            80
30/04/2008            80
Total                 80

Therefore accumilative in nature. In T-SQL this can be acheived by linking between Fact and DimTable on TRID and not on LTID, but this breaks the rule of a many-to-many solution as these tables to each other ALSO has a M2M relationship.


Hertfordshire, England

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