what is fact and what types of fact tables is there
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Fact: It is an object that is being analyzed.
Fact table: It consists of a composite key and facts, where ever attribute of the composite key is a foreign key to the dimension table or summarized information.
Two Types Of Fact Tables:
1) Cumulative Fact Table: Describes what was happened over the period of time. They contain addition facts.
2) Snap shot Fact Table: Deals with the particular period time. They contain non-additive and semi-additive facts.
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A Fact table contains unique combination of dimensional keys.
Fact tables are normalized.
A Fact tables have the facts at the lowest level of granularity.
Types of Fact table:
There are 3 types .
1)Detailed Fact table
2)Aggregate/Summarize fact table
3)Factless fact table
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If sal is null then replace it with min(sal). Can any one write a query for this in oracle ? Advance Thanks
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