EBK DATABASE SYSTEM CONCEPTS
7th Edition
ISBN: 9781260049268
Author: SILBERSCHATZ
Publisher: MCG COURSE
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Expert Solution & Answer
Chapter 6, Problem 11PE
Explanation of Solution
a.
Justification:
- Normally, the primary key, foreign key and not null constraints are used to enforce total participation constraints on a many-to-many relationship on the relations created from the relationship.
- However, in Structured Query Language (SQL) total participation constraints on a many-to-many relationship can’t be enforced on the relations created from the relationship because, they have to be embodied as separate relation that will not be combined with either of the participating entities...
Explanation of Solution
b.
Enforcing total participation constraints using complex check constraints or assertions:
- For a many-to-one relation R from entity “A” to “B” with their respective primary keys as “a” and “b”, the below constraints can be applied on relation “B”...
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a
a
a
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Chapter 6 Solutions
EBK DATABASE SYSTEM CONCEPTS
Ch. 6 - Prob. 1PECh. 6 -
Consider a database that includes the entity sets...Ch. 6 -
Design an E-R diagram for keeping track of the...Ch. 6 - Prob. 4PECh. 6 - Prob. 5PECh. 6 - Prob. 6PECh. 6 - Prob. 7PECh. 6 -
Consider a relation such as sec_course, generated...Ch. 6 -
Suppose the advisor relationship set were...Ch. 6 - Prob. 10PE
Ch. 6 - Prob. 11PECh. 6 - Prob. 12PECh. 6 - Prob. 13PECh. 6 - Prob. 14ECh. 6 - Prob. 15ECh. 6 - Prob. 16ECh. 6 - Prob. 17ECh. 6 -
Consider two entity sets A and B that both have...Ch. 6 - Prob. 19ECh. 6 - Prob. 20ECh. 6 - Prob. 21ECh. 6 - Prob. 22ECh. 6 - Prob. 23ECh. 6 -
Design a database for an airline. The database...Ch. 6 - Prob. 25ECh. 6 -
Design a generalization – specialization...Ch. 6 -
Explain the distinction between disjoint and...Ch. 6 -
Explain the distinction between total and partial...
Knowledge Booster
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