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Give examples of degenerated dimensions

  
Total Answers and Comments: 2 Last Update: August 14, 2006     Asked by: stalin 
  
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August 14, 2006 11:57:22   #1  
Bie Tie        

RE: Give examples of degenerated dimensions

Degenerated Dimension is a dimension key without corresponding dimension. Example:

     In the PointOfSale Transaction Fact table, we have:

         Date Key (FK), Product Key (FK), Store Key (FK), Promotion Key (FP), and POS Transaction Number  

Date Dimension corresponds to Date Key, Production Dimension corresponds to Production Key. In a traditional parent-child database, POS Transactional Number would be the key to the transaction header record that contains all the info valid for the transaction as a whole, such as the transaction date and store identifier. But in this dimensional model, we have already extracted this info into other dimension. Therefore, POS Transaction Number looks like a dimension key in the fact table but does not have the corresponding dimension table.

Therefore, POS Transaction Number is a degenerated dimension.

  

 


 
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August 14, 2006 12:01:38   #2  
siokbietie Member Since: August 2006   Contribution: 1    

RE: Give examples of degenerated dimensions

Degenerated Dimension is a dimension key without corresponding dimension. Example:

     In the PointOfSale Transaction Fact table, we have:

         Date Key (FK), Product Key (FK), Store Key (FK), Promotion Key (FP), and POS Transaction Number  

Date Dimension corresponds to Date Key, Production Dimension corresponds to Production Key. In a traditional parent-child database, POS Transactional Number would be the key to the transaction header record that contains all the info valid for the transaction as a whole, such as the transaction date and store identifier. But in this dimensional model, we have already extracted this info into other dimension. Therefore, POS Transaction Number looks like a dimension key in the fact table but does not have the corresponding dimension table.

Therefore, POS Transaction Number is a degenerated dimension.


 
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Information Packages(IP) are advanced by some author as a way of building dimensional models - e.g. star schemas. Explain what IPs are and Give an example of it\'s use in building a dimensional model.
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Latest Answer : Junk Dimension also called as garbage dimension. A garbage dimension is a dimension that consists of low-cardinality columns such as codes, indicators, status,and flags. The garbage dimension is also referred to as a junk dimension. Attributes in a garbage ...
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Latest Answer : Degenerated Dimension is a dimension key without corresponding dimension. Example:     In the PointOfSale Transaction Fact table, we have:         Date Key (FK), Product Key (FK), Store ...
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