Combine data sources with different granularity in the same fact table?

I have two operating tables 'Incident (157 columns)' and 'unit (70 Colums) '. For all the "incidents" happening there could be one or more records in the table of the 'unit '.

As part of my design of data mart, I have merged the tables in one "makes the incident (227 columns)" and insert records from two tables with a join condition between them [incident. IN_NUM = Unit.IN_NUM].

Is this correct, is my question? or am I mix data sources with different granularity in the same fact table. Appreciate your help.

Best regards
Bees

Bees,
Are the measures of the 'Incident', repeated during an incident given, in more than one record in the table of the unit? If so, then the sum (indicent.measure) will give an incorrect result?

What is there to merge physically tables set outside OBIEE? With OBIEE you might have a table of 'facts' logic to present the user with report, which from tables separated units and Incidents and would stop the occurrence of incorrect aggregations. A common piece of modeling in the same way would be arrested in OBIEE headers and lines of command, quite common to have a logical fact 'orders' which contained the two header orders and order line, this translates into the Incidents-> relationship of units.

To do what I mentioned, is relatively simple, you need a "Dim - Incident" at two levels, unit, mapp and Incident unique identifiers as keys to level and then use these levels to define the content of the levels correctly in your 2 tables logic sources logic "done", IE the LTS Incidents at incident level LTS units as level of units.

Hope this helps, let us know if you get stuck.
See you soon
Alastair

Tags: Business Intelligence

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