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4.2)) 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), (4,7) and (3,4). Assume that Relation S contains the following tuples (2,2), (2,3), (4,6) and (7,5). a) (1 Points) Give an example of an attribute (or a combination of attributes) that cannot be a primary key for relation S, why? b) (1 Points) How many tuples are in the result of the Cartesian Product between R and S? c) (1 Points) How many tuples are in the result of Natural Join between R and S?

4.2)) 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), (4,7) and (3,4). Assume that Relation S contains the following tuples (2,2), (2,3), (4,6) and (7,5). a) (1 Points) Give an example of an attribute (or a combination of attributes) that cannot be a primary key for relation S, why? b) (1 Points) How many tuples are in the result of the Cartesian Product between R and S? c) (1 Points) How many tuples are in the result of Natural Join between R and S?

Computer Networking: A Top-Down Approach (7th Edition)
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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4.2

4.1) Given the following information, for each one of the BOLD words (note there are 3 in each one), specify whether the word will be mapped into an entity, attribute, relationship, or value in the corresponding database. a) The make of my Red vehicle is Chevy. b) Instructor Smithy teaches three courses. I 4.2)) 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), (4,7) and (3,4). Assume that Relation S contains the following tuples (2,2), (2,3), (4,6) and (7,5). a) (1 Points) Give an example of an attribute (or a combination of attributes) that cannot be a primary key for relation S, why? b) (1 Points) How many tuples are in the result of the Cartesian Product between R and S? c) (1 Points) How many tuples are in the result of Natural Join between R and S? D, Focus di (2 Points) Show the output of the following auery 66°F Partly sunny
Transcribed Image Text:4.1) Given the following information, for each one of the BOLD words (note there are 3 in each one), specify whether the word will be mapped into an entity, attribute, relationship, or value in the corresponding database. a) The make of my Red vehicle is Chevy. b) Instructor Smithy teaches three courses. I 4.2)) 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), (4,7) and (3,4). Assume that Relation S contains the following tuples (2,2), (2,3), (4,6) and (7,5). a) (1 Points) Give an example of an attribute (or a combination of attributes) that cannot be a primary key for relation S, why? b) (1 Points) How many tuples are in the result of the Cartesian Product between R and S? c) (1 Points) How many tuples are in the result of Natural Join between R and S? D, Focus di (2 Points) Show the output of the following auery 66°F Partly sunny
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