Consider the Is_married_to unary relationship in Figure 8-14c. a. Assume that we want to know the date
Question:
Consider the Is_married_to unary relationship in Figure 8-14c.
a. Assume that we want to know the date on which a marriage occurred. Augment this E-R diagram to include a Date_married attribute.
b. Because persons sometimes remarry after the death of a spouse or a divorce, redraw this E-R diagram to show the whole history of marriages (not just the current marriage) for persons. Show the Date_married attribute on this diagram.
c. In your answer to Problem and Exercise 8.63b, is it possible to represent a situation in which the same two people marry each other a multiple number of times? Explain.
Figure 8-14c
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a To augment the ER diagram to include a Datemarried attribute for the Ismarriedto unary relationshi...View the full answer
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Related Book For 
Modern Systems Analysis And Design
ISBN: 9781292351629
9th Global Edition
Authors: Joe Valacich, Joey George
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