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IBM Cognos 10 Framework Manager

You're reading from  IBM Cognos 10 Framework Manager

Product type Book
Published in May 2013
Publisher Packt
ISBN-13 9781849685764
Pages 186 pages
Edition 1st Edition
Languages
Author (1):
Terence Phillip Curran Terence Phillip Curran
Profile icon Terence Phillip Curran

Table of Contents (19) Chapters

Cardinality


Framework manager uses the cardinality of the joins between tables to identify dimension and fact tables.

Cardinality affects how queries are written, and thus affects the results of the query. Framework Manager allows cardinality to be specified by the modeler or generated based on the criteria while importing from the database.

The general rules that apply to cardinality are as follows:

  • Cardinality is applied in the context of a query, and only the cardinalities of items explicitly included in the query are evaluated

  • Query subjects defined with one-to-many or zero-to-many cardinalities are always identified as facts

  • Query subjects defined with one-to-one or zero-to-one cardinalities are always identified as dimensions

  • It is possible to have a query subject that behaves as a dimension in one query and as a fact in another

A query subject that has only maximum (n) cardinality for all of its relationships to other query subjects can be regarded as a fact. This implies that there are...

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