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Database Systems by Shripad V. Godbole, Elvis C. Foster

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CHAPTER 8

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Relational Calculus

This chapter discusses relational calculus as an alternate way of manipulating relations in a database. The partial college database, introduced in the previous chapter (Figures 7-1 and 7-2) will be used as a frame or reference. It must be constantly borne in mind that relational algebra and relational calculus are mutual equivalents; most DBMS suites will implement one or the other, or aspects of both, depending on what is convenient to the developers. The chapter proceeds under the following subtopics:

  • Introduction
  • Calculus Notations and Illustrations
  • Quantifiers, Free and Bound Variables
  • Substitution Rule and ...

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