Consider the relation schemas R(A,B) and S(A,B). Suppose {A } is the key for R and also the key for S. Which of the following is the (minimal) key for RUS? Select one: O {A, B } Not enough information to determine the key. O {A} O {B }

Consider the relation schemas R(A,B) and S(A,B). Suppose {A } is the key for R and also the key for S. Which of the following is the (minimal) key for RUS? Select one: O {A, B } Not enough information to determine the key. O {A} O {B }

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Question

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Consider the relation schemas R(A,B) and S(A,B). Suppose { A} is the key for Rand also the key for S.
Which of the following is the (minimal) key for RUS?
Select one:
O {A, B }
O Not enough information to determine the key.
O {A}
O {B }

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