Relation Schema

Represented as:

Rel_name(Attr_1:D_1,…,Attr_n:D_n

where:

  • Rel_name: relation identifier
  • Attr_i: attribute name
  • D_1: basic domain.
  • n: degree of relation.
  • Rel_name also called n-ary tuples.
  • Relation schema is also called intension and is time-invariant.
  • Instances of a relation at some point in time are called the relation's extension. The relation extension is dynamic.

 

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