Logical Data Modeling - Constraint


A constraint is a metadata rule that expresses a condition or restriction in natural language text or in a machine readable language for the purpose of declaring some data or process semantics.


  • Structure: All rows must have the same number of columns
  • Data domain: All value in a column must have the same type
  • Relationship: A child cannot have three parents
  • Business rule: A product cannot be send to a client that was not verified.

Documentation / Reference

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