Some high level language constructs for data of type relation

  • Authors:
  • Joachim W. Schmidt

  • Affiliations:
  • Univ. Hamburg, Hamburg, West Germany

  • Venue:
  • ACM Transactions on Database Systems (TODS)
  • Year:
  • 1977

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Abstract

For the extension of high level languages by data types of mode relation, three language constructs are proposed and discussed: a repetition statement controlled by relations, predicates as a generalization of Boolean expressions, and a constructor for relations using predicates. The language constructs are developed step by step starting with a set of elementary operations on relations. They are designed to fit into PASCAL without introducing too many additional concepts.