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What is a degenerate dimension?

  1. A A dimension attribute such as an invoice number stored in the fact table with no separate dimension
  2. B A dimension with missing values
  3. C An unused dimension
  4. D A dimension with only one row
Answer

A dimension attribute such as an invoice number stored in the fact table with no separate dimension

Transaction identifiers have no descriptive attributes worth a separate table, so they sit directly on the fact row.

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