April 2016
Intermediate to advanced
712 pages
18h 34m
English
Content preview from Relational Database Design and Implementation, 4th Edition
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Chapter 6
Relational Algebra
Abstract
This chapter discusses the relational algebra operations that underlie both database design and SQL. The chapter emphasizes the procedural nature of relational algebra, and that the operations are used primarily by SQL command processors, rather than issued directly by a user.
Keywords
relational algebra
relational algebra project
relational algebra select
relational algebra restrict
relational algebra join
relational algebra difference
relational algebra intersect
relational algebra divide
relational algebra union
When we use SQL to manipulate data in a database, we are actually using something known as the relational calculus, a method for using a single command to instruct the DBMS to perform one or more ...
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