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The following questions let you think deeper about the concepts of the Relational Algebra. (a) Let R(A1,A2,A3,A4) be the schema of a relation R, and

The following questions let you think deeper about the concepts of the Relational Algebra. (a) Let R(A1,A2,A3,A4) be the schema of a relation R, and let C1,...,C4 be conditions on A1,...,A4. Does...

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