Tuesday, 27 August 2013

Types of Facts

Fact

A fact table typically has two types of columns, foreign keys to dimension tables and measures those that contain numeric facts. A fact table can contain fact’s data on detail or aggregated level.
Eg: Sales, Cost, and Profit


Types of Facts
  1. Non-Additive
  2. Semi-Additive
  3. Additive

Additive

Additive facts are facts that can be summed up through all of the dimensions in the fact table.
Eg: Sales fact

Semi-Additive

Semi-additive facts are facts that can be summed up for some of the dimensions in the fact table, but not the others.
Eg: Daily balances fact can be summed up through the customers dimension but not through the time dimension.

Non-Additive

Non-additive facts are facts that cannot be summed up for any of the dimensions present in the fact table.
Eg: Facts which have percentages, Ratios calculated.

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