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DBMS Korth Edition 6 Exercise 7 Question 5 (Page No. 316)
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An E-R diagram can be viewed as a graph. What do the following mean in
terms of the structure of an enterprise schema?
a. The graph is disconnected.
b. The graph has a cycle.
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DBMS Korth Edition 6 Exercise 7 Question 6 (Page No. 316-317)
Consider the representation of a ternary relationship using binary relationships as described in this book and illustrated in Figure (b) (attributes not shown) a. Show a simple instance of E, A, B,C, RA, RB, and RC that cannot correspond ... for E. Show how to treat E as a weak entity set so that a primary-key attribute is not required.
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DBMS Korth Edition 6 Exercise 7 Question 4 (Page No. 316)
Consider an E-R diagram in which the same entity set appears several times, with its attributes repeated in more than one occurrence. Why is allowing this redundancy a bad practice that one should avoid?
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DBMS Korth Edition 6 Exercise 7 Question 3,17 (Page No. 316-319)
Design an E-R diagram for keeping track of the exploits of your favorite sports team. You should store the matches played, the scores in each match, the players in each match, and individual player statistics for each match. ... . b)Extend the E-R diagram of above exercise to track the same information for all teams in a league.
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DBMS Korth Edition 6 Exercise 7 Question 1 (Page No. 316)
Construct an E-R diagram for a car insurance company whose customers own one or more cars each. Each car has associated with it zero to any number of recorded accidents. Each insurance policy covers one or more cars and has one ... is for a particular period of time and has an associated due date, and the date when the payment was received.
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