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1.4.08. Cardinality

  • Specifies number of relationship instances a single entity can participate in
  • S:T (1:1)
  • An entity from table S can is related to one, and only one entity from table T
  • 1:1, 1:N, N:M
    • DEPARTMENT : EMPLOYEE
    • EMPLOYEE : EMPLOYEE
    • PROJECT : EMPLOYEE
‹ 1.4.07. ER to Relational mappingup1.4.09. ER to Relational mapping ›
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