Database Systems: Design, Implementation, & Management
13th Edition
ISBN: 9781337627900
Author: Carlos Coronel, Steven Morris
Publisher: Cengage Learning
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Expert Solution & Answer
Chapter 4, Problem 13RQ
Explanation of Solution
Composite entity:
A composite entity is normally used to convert M: N relationships into 1: M relationships. It is also referred as “bridge entity”, which has a primary key (PK) composed of multiple attributes.
- The PK attributes are inherited from the entities, which it associates to one another.
Usage of composite entity in ERD:
In the Entity Relationship Management (ERM), an M: N relationship is effective at the conceptual level. But when implementing the ERM in a relational
Example:
Consider the entities CLASS and STUDENT with M: N relationship defined by following business rules:
- A student can take several classes...
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Students have asked these similar questions
1. Complete the routing table for R2 as per the table shown below when implementing RIP routing
Protocol?
(14 marks)
195.2.4.0
130.10.0.0
195.2.4.1
m1
130.10.0.2
mo R2
R3
130.10.0.1
195.2.5.1
195.2.5.0
195.2.5.2
195.2.6.1
195.2.6.0
m2
130.11.0.0
130.11.0.2
205.5.5.0
205.5.5.1
R4
130.11.0.1
205.5.6.1
205.5.6.0
Analyze the charts and introduce each charts by describing each. Identify the patterns in the given data. And determine how are the data points are related.
Refer to the raw data (table):
3A) Generate a hash table for the following values: 11, 9, 6, 28, 19, 46, 34, 14. Assume the table size is
9 and the primary hash function is h(k) = k % 9.
i) Hash table using quadratic probing
ii) Hash table with a secondary hash function of h2(k) = 7- (k%7)
3B) Demonstrate with a suitable example, any three possible ways to remove the keys and yet
maintaining the properties of a B-Tree.
3C) Differentiate between Greedy and Dynamic Programming.
Chapter 4 Solutions
Database Systems: Design, Implementation, & Management
Ch. 4 - Prob. 1RQCh. 4 - What is a strong (or identifying) relationship,...Ch. 4 - Prob. 4RQCh. 4 - Suppose you are working within the framework of...Ch. 4 - Prob. 6RQCh. 4 - Prob. 7RQCh. 4 - Discuss the difference between a composite key and...Ch. 4 - What two courses of action are available to a...Ch. 4 - What is a derived attribute? Give an example. What...Ch. 4 - Prob. 11RQ
Ch. 4 - Discuss two ways in which the 1:M relationship...Ch. 4 - Prob. 13RQCh. 4 - Prob. 14RQCh. 4 - Briefly, but precisely, explain the difference...Ch. 4 - What are multivalued attributes, and how can they...Ch. 4 - Prob. 17RQCh. 4 - Prob. 18RQCh. 4 - What two attributes must be contained in the...Ch. 4 - Describe precisely the composition of the...Ch. 4 - Prob. 21RQCh. 4 - Prob. 1PCh. 4 - Create a complete ERD in Crows Foot notation that...Ch. 4 - Prob. 4PCh. 4 - Prob. 5PCh. 4 - Prob. 6PCh. 4 - Prob. 7PCh. 4 - Prob. 8PCh. 4 - Prob. 9PCh. 4 - Prob. 10PCh. 4 - Prob. 11C
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