Give an example of an attitube (combination) that cannot be a key for relation s . How many tippets are in the result of the cross product between R and S . how many tuples are in the result of the following relational algebra expression . 2. Assume we have two relations R(A,B) and S(B,C). All three attributes (A, B, and C) are integer attributes.Assume that Relation R contains the following tuples: (1,2), (2,3), and (3,4). Assume that Relation S con-tains the following tuples (2,2), (2,3), (4,1) and (5,1). Recall that a key is a minimal superkey, and that a keyis not a superkey.(a) Give an example of an attribute (combination) that cannot be a key for relation S.(b) How many tuples are in the result of the cross-product between R and S?(c) How many tuples are in the result of the following relational algebra expression: TA(R S)

Answer: R: a b 1 2 2 3 3 4 S: b c 2 2 2 3 7 1 In relation S, b cannot be the…

Answered: 2. Assume we have two relations R(A,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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Give an example of an attitube (combination) that cannot be a key for relation s .
How many tippets are in the result of the cross product between R and S .
how many tuples are in the result of the following relational algebra expression .

2. Assume we have two relations R(A,B) and S(B,C). All three attributes (A, B, and C) are integer attributes.
Assume that Relation R contains the following tuples: (1,2), (2,3), and (3,4). Assume that Relation S con-
tains the following tuples (2,2), (2,3), (4,1) and (5,1). Recall that a key is a minimal superkey, and that a key
is not a superkey.
(a) Give an example of an attribute (combination) that cannot be a key for relation S.
(b) How many tuples are in the result of the cross-product between R and S?
(c) How many tuples are in the result of the following relational algebra expression: TA(R S)

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