What is a composite key in a database?

/ By / MOD PAST PAPERS MCQs
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  1. Set of one or more attribute that can be used to uniquely identify the records in a table
  2. The minimal set of attribute that uniquely identifies each occurrence of an entity type
  3. The candidate key that is selected to uniquely identify each occurrence of an entity type
  4. A candidate key that consists of two or more attributes

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