Equality join - PowerPoint PPT Presentation

Relational Algebra and My SQL

Lecture 5 CS157B. Relational Algebra and My SQL. Prof. Sin Min Lee Deparment of Computer Science San Jose State University. Functional Dependency. A, B  R(….) , we say FD: AB if. For all t1, t2 element of R if t1[A] = t2[A] =&gt; t1[B] = t2[B]. Definition: A  R(….) is a key if FD: A.

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RELATIONAL ALGEBRA and Computer Assignment 1

Lecture 3. CS157B. RELATIONAL ALGEBRA and Computer Assignment 1. Prof. Sin-Min LEE Department of Computer Science. Codd’s Relational Algebra. A set of mathematical operators that compose, modify, and combine tuples within different relations

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Chapter 4 Joining Multiple Tables

Chapter 4 Joining Multiple Tables. Purpose of Joins. Joins are used to link tables and reconstruct data in a relational database Joins can be created through: Conditions in a WHERE clause Use of JOIN keywords in FROM clause. Cartesian Join.

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