May 2024
Intermediate to advanced
325 pages
12h 2m
English
Content preview from Distributed Database Systems, 1st Edition by Chhanda Ray
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Distributed Database Systems
In 1972, Codd originally proposed eight operations of relational algebra, but several others
have also been developed subsequently. The fi ve fundamental operations of relational algebra
are selection, projection, Cartesian product, union and set difference. The fi rst two among these
are unary operations and the last three are binary operations. In addition, there are three derived
operations of relational algebra, namely, join, intersection and division, which can be represented
in terms of the fi ve fundamental operations.
1.4.1 Selection Operation
The selection operation operates on a single relation and selects ...
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