Why Study the Relational Model?

• Most widely used model.

  • Vendors: IBM, Informix, Microsoft, Oracle, Sybase, etc.

• “Legacy systems” in older models

  • E.G., IBM’s IMS

• Recent competitor: object-oriented model

  • ObjectStore, Versant, Ontos, O2
  • A synthesis emerging: object-relational model
    • Informix Universal Server, UniSQL, Oracle, DB2

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