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Question: what is junk dimension?
what is the difference between junk dimension and degenerated dimension?

Answer: Junk dimension: Grouping of Random flags and text Attributes in a dimension and moving them to a separate sub dimension.


Degenerate Dimension: Keeping the control information on Fact table ex: Consider a Dimension table with fields like order number and order line number and have 1:1 relationship with Fact table, In this case this dimension is removed and the order information will be directly stored in a Fact table inorder eliminate unneccessary joins while retrieving order information..

Junk dimension: Grouping of Random flags and text Attributes in a dimension and moving them to a separate sub dimension.


Degenerate Dimension: Keeping the control information on Fact table ex: Consider a Dimension table with fields like order number and order line number and have 1:1 relationship with Fact table, In this case this dimension is removed and the order information will be directly stored in a Fact table inorder eliminate unneccessary joins while retrieving order information.. Source: CoolInterview.com

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