Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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Question
What is the relationship between DVD and Book?
A.- Dependency
B - Generalization(Inheritance)
C - Association
D - Composition
E - Aggregation
F - No relationship exists
Transcribed Image Text:<<entity>>
Book
-author
+setAuthor()
«entity>>
Student
-sName
-sld
<<entity>>
Inventoryltem
price
+setPrice()
4
1
<<entity>>
DVD
-manufacturer
+setManufacturer()
«entity>>
Course
1 -cNum
cName
<<entity>>
Schedule
<<entity>>
Company
<<boundary>>
ClientDisplay
1
<<entity>>
Department
<<control>>
Supplier
Expert Solution
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Step 1
DVD and Book both are making an Generalization (inheritance) relationship with InventoryItem.
A. There is no dependency relationship between DVD and Book.
B. obviously there is no inheritance relationship between DVD and Book.
C. An arrow is used to show the relationship between associations. So there is no such relationship exists between DVD and Book.
D. Composition relationships are represented by a straight line with a black diamond at one end. So, there is no composition relationship between DVD and Book.
E. A straight line with an empty diamond at one end symbolizes an aggregation relationship. So, there is no aggregation relationship between DVD and Book.
F. Because all the above options are incorrect, the correct answer is no relationship exists.
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