Different types of facts.

Type of facts are:

Additive: Additive facts are facts that can be summed up through all of the
dimensions in the fact table. A sales fact is a good example for
additive 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.