Closure algorithm - PowerPoint PPT Presentation

Database Management Systems Chapter 3 The Relational Data Model (II)

Database Management Systems Chapter 3 The Relational Data Model (II). Instructor: Li Ma Department of Computer Science Texas Southern University, Houston. September, 2007. Functional Dependencies. Meaning of FD’s Keys and Superkeys Rules about FD’s. Functional Dependencies.

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Closure and Algorithms

Closure and Algorithms. Section 1.6 Mon, Sep 12, 2005. Transitive Closure. A relation R on a set A is transitively closed if the transitive property holds. ( a , b )  R and ( b , c )  R , then ( a , c )  R .

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Functional Dependencies

Functional Dependencies. Definition: If two tuples agree on the attributes . A , A , … A . 1. 2. n. then they must also agree on the attributes. B , B , … B . 1. 2. m. Formally:. A , A , … A . B , B , … B . 1. 2. m. 1. 2. n.

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