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An Equijoin is a Theta Join that only involves equalities; for reference, a Theta Join joins on a formula (theta) that consists of arithmetic comparisons between attributes of the sets being joined.
A Natural Join is an Equijoin that returns all tuples agreeing on the values of their common attributes.
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Relational Algebra - 3
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An Equijoin is a Theta Join that only involves equalities; for reference, a Theta Join joins on a formula (theta) that consists of arithmetic comparisons between attributes of the sets being joined. A Natural Join is an Equijoin that returns all tuples agreeing on the values of their common attributes.