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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
Distributed Query Processing
187
query. The well-known idempotency rules of Boolean algebra are used to eliminate redundancies
from the given query, which are listed below.
P P P
P P P
P true P
P false false
P true true
P false P
P (P) false
P (P) true
P (P Q) P
P (P Q) P
Example 11.6
Let us consider the following view defi nition and a query on the view that involves the relation
Employee (empid, ename, salary, designation, deptno).
Create view V1 as select empid, ename, salary from Employee where deptno 10;
Select * from V1 where deptno 10 and salary > 10000;
During query resolution, the query will be:
Select ...
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