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Distributed Database Systems, 1st Edition by Chhanda Ray
book

Distributed Database Systems, 1st Edition by Chhanda Ray

by Chhanda Ray
May 2024
Intermediate to advanced content levelIntermediate to advanced
325 pages
12h 2m
English
Pearson India
Content preview from Distributed Database Systems, 1st Edition by Chhanda Ray
12
Distributed Database Systems
1.4.7 Join Operation
The join operation is derived from the Cartesian product operation of relational algebra. We can
say join operation is a combination of the operations selection, projection and Cartesian product.
There are various forms of join operation such as theta join, equi join, natural join, outer join and
semijoin. The outer join operation is further classifi ed into full outer join, left outer join and right
outer join.
(i) Theta join (θ) – The most common join operation is theta join. The theta join operation of two
relations R and S defi nes a relation that contains tuples satisfying a join predicate ...
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Publisher Resources

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