Database Design Multiple Choice Let us apply class material: In a conceptual dat

Question

Database Design Multiple Choice

Let us apply class material: In a conceptual database schema C, there is a superclass entity T. T has an attribute-defined cluster of total and overlapping subclasses based on the attribute P. There are two subclasses, U1 and U2, in this cluster. In a valid state of C, entities e1, e2, and e3 are already in T. C would still be valid if it also includes___. (a) entity e4 which is also in T but not U1 nor in U2 (b) entity e4 which is also in U1 but not in T nor in U2 (c) entity e4 which is also in T, U1, and U2 (d) entity e4 which is also in U1 and U2 but not in T (e) None of (a) through (d) is a correct answer.

Explanation / Answer

Since entities e1, e2 and e3 are already in T.

Where T is a superclass entity.

T has an attribute - defined cluster of total and overlapping clusters.

There are two sub classes those are U1 and U2.

Option c is correct.

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