Data Warehousing and Data Science

13 March 2011

The Word “Fact” – Terminology Clarification

Filed under: Data Warehousing — Vincent Rainardi @ 10:31 am

In dimensional data warehousing, the word “Fact” in means a measure, i.e. a single numeric column.

The word “Fact Table” means a database table or view that contains the Fact or Measure columns.

Above are what Ralph Kimball and Margy Ross used in their Toolkit book (link).

Lately, I heard people use the word “Fact” to refer to a fact table. For example “A fact has measures”. I’m not saying it’s wrong, as people can term it as they like. I’m saying that it is not standard. I put a post here so that the community is not surprised when you heard the word “Fact” used in that way.

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