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Chapter 3

The Relational Model

  1. The first database systems were based on the network and hierarchical models. These are covered briefly in appendices in the text. The relational model was first proposed by E.F. Codd in 1970 and the first such systems (notably INGRES and System/R) was developed in 1970s. The relational model is now the dominant model for commercial data processing applications.

  2. Note: Attribute Name Abbreviations

    The text uses fairly long attribute names which are abbreviated in the notes as follows.

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