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...

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Chapter 15, Problem 10PE

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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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