EBK DATABASE CONCEPTS
7th Edition
ISBN: 9780133544886
Author: AUER
Publisher: PEARSON CUSTOM PUB.(CONSIGNMENT)
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Chapter 5, Problem 5.34RQ
Explanation of Solution
Intersection Table:
- Relational
database system will not allow the user to implement a direct many-to-many relationship. So, the many-to-many relationship will break into two one-to-many relationships by using third table, it is called as “intersection table”. - The intersection table contains primary key of the two tables as a foreign key.
Recursive many-to-many relationship (N:M):
- Recursive many-to-many relationship is one of the types of recursive binary relationship that refer to the relationship between two entities which means many fields or records in a table are associated with many fields or records in another table in recursive manner.
- Let us consider the example:
- The “Agent” can buy or sell the property to any other agent in recursive manner.
Explanation:
- The “Agent_ID” is a primary key of the “Agent” table. The “Agent_for_Agent” is the intersection table which contains “Client_Agent_ID” and “Selling_Agent_ID” as the foreign keys.
- “Client_Agent_ID” contains the “Agent_ID” of the agent buying the property and “Selling_Agent_ID” contains the “Agent_ID” of the agent acting as the selling agent...
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Chapter 5 Solutions
EBK DATABASE CONCEPTS
Ch. 5 - Explain how entities are transformed into tables.Ch. 5 - Prob. 5.2RQCh. 5 - Prob. 5.3RQCh. 5 - What is denormalization?Ch. 5 - Prob. 5.5RQCh. 5 - Explain the problems that denormalized tables may...Ch. 5 - Explain how the representation of weak entities...Ch. 5 - Explain how supertype and subtype entities are...Ch. 5 - Prob. 5.9RQCh. 5 - Prob. 5.10RQ
Ch. 5 - Show two different ways to represent the 1:1...Ch. 5 - Prob. 5.12RQCh. 5 - Prob. 5.13RQCh. 5 - Prob. 5.14RQCh. 5 - Prob. 5.15RQCh. 5 - Prob. 5.16RQCh. 5 - For your answer to question 5.15, code an SQL...Ch. 5 - Prob. 5.18RQCh. 5 - Prob. 5.20RQCh. 5 - Prob. 5.21RQCh. 5 - Explain how the terms parent table and child table...Ch. 5 - For your answers to questions 5.20, 5.21, and...Ch. 5 - Prob. 5.24RQCh. 5 - Prob. 5.25RQCh. 5 - Prob. 5.26RQCh. 5 - Prob. 5.27RQCh. 5 - Prob. 5.28RQCh. 5 - Define the three types of recursive binary...Ch. 5 - Prob. 5.30RQCh. 5 - Prob. 5.31RQCh. 5 - Prob. 5.32RQCh. 5 - Prob. 5.33RQCh. 5 - Prob. 5.34RQCh. 5 - Code an SQL statement that creates a table with...
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