DATABASE SYSTEM CONCEPTS LCPO
7th Edition
ISBN: 9781265586577
Author: SILBERSCHATZ
Publisher: MCG
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Chapter 15, Problem 10PE
Explanation of Solution
a.
Semi-join operation:
- Consider the two given relation “r” and “s”. To perform semi-join operation between the two relations using sorting:
- Initially, sort the relation “r” on the join attributes in predicate θ.
- Then sort relation “s” on the join attributes in predicate θ.
- Like merge
algorithm , scan the relation “r” and “s”. - Check whether the join attributes of current records of relation “r” and “s” is match.
- Add records of relation “r” to the result...
Explanation of Solution
b.
Anti-semi-join operation:
- To perform anti-semi-join operation between the two relation using sorting;
- Initially, sort relation “r” on the join attributes in predicate θ.
- Next, sort relation “s” on the join attributes in predicate θ.
- Like merge algorithm, scan the relation “r” and “s”.
- Check if no record of relation “s” gratifies the join predicate for the corresponding record in “r”...
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Chapter 15 Solutions
DATABASE SYSTEM CONCEPTS LCPO
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