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Primary Key

A Primary Key uniquely identifies a record in a table and can consist of one or more columns.

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Types of Primary Key

In Enterprise Architect, a:

  • Simple Primary Key (single column) is defined as the attribute of a stereotyped operation
  • Complex Primary Key (several columns) is defined as the stereotyped operation itself
     
    For example, a column LastName might not be unique within a table, so a Primary Key is created from the LastName, FirstName and DateOfBirth columns

 

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