Tables in DWH

Dimensions:

  • Dimensions are attributes about facts.
  • They store textual description about business.
  • Dimensions are denormalized due to one to many relationships

Ex: Store, Product, Employee, Customers

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Facts:

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Facts are the actual transactions or values being analyzed

  • They contain composite primary key where each attribute of a primary key is a foreign key to the dimension tables
  • A fact table contains the facts at the lowest level granularity

FACT:

  • Prod Id, Cust Id, Sales Date are Dimension Keys.
  • Quantity Sold, Amount Sold is Fact Measures/KPI’s
  • KPI stands for Key Performance Indicators
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