relational algebra, Database Management System

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what is union compatable?

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What is known as a search key? An attribute or set of attributes used to look up records in a file is known as a search key.

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If R1 and R2 are two union compatible relations or functions, then the result of R3 = R1 ∩R2 is the relation that contains all tuples that are in both the relations In other words,

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