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Good question
Consider the relations r(A, B) and s(B, C), where s. B is a primary key and r. B is a foreign key referencing s. B. Consider the queryQ:r join (σβ
Good question
Consider the relations r(A, B) and s(B, C), where s. B is a primary key and r. B is a foreign key referencing s. B. Consider the query
Q:r join (σβ