Discussion
Consider the join of a relation R with relation S. If R has m tuples and S has n tuples, then the maximum size of join is:
Answer: A
Correct answer: mn
A join is a selection applied to the Cartesian product, so it can never return more tuples than the product itself, which has \(m \times n\). That maximum is reached only when the join condition matches every pair - in effect a cross join. A typical equijoin on a foreign key returns far fewer.
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