Database Concepts (7th Edition)
7th Edition
ISBN: 9780133544626
Author: David M. Kroenke, David J. Auer
Publisher: PEARSON
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Chapter 5, Problem 5.12RQ
Explanation of Solution
The method for obtaining data:
After showing the two way of representing the 1:1 relationship in question 5.11 then creates a method for obtaining data about one of the entities given the key of the other.
To go from “HOD” table to “Department” table:
- The first way representing the 1:1 relationship is placing “HOD_ID” into the “Department” table as a foreign key. So, look up the “HOD_ID” in “Department” table.
- The second way is placing “Dep_ID” into the “HOD” table as a foreign key and uses the “HOD_ID” to get the row of “HOD”, then obtain “Dep_ID” from “HOD” and look up the row in “Department” using “Dep_ID” obtained...
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Students have asked these similar questions
There are two alternative methods of representing an employee’s optional (single) phone number. The first is to use a nullable attribute and the second is to use a weak entity. 1. Given a requirement that a large number of the employees (> 80%) are assigned a phone number, which is the preferred method and why? 2. Given a requirement that only a small number of employees (< 10%) are assigned phone numbers, which is the preferred method and why? 3. How would the requirement of ‘multiple phone numbers can be assigned to an Employee’ affect your decision?
Your answers should consider the performance tradeoff between number of database operations per query and record’s size.
Create an E-R model for the following scenario.
Show entity names, primary keys, attributes for each entity, relationships between the entities and
cardinality.
Lonestar Car Dealer is a leading car dealership in US. The dealership sells both new and used cars,
and it has a service facility as well. There are a couple of requirements that the database must meet.
Those are as follows.
Each car is sold by a salesperson. One car sale has only one salesperson. But one salesperson may
sell many cars.
Customers buy one or many cars. But single sale can have only one customer (No multiple
customers for a given car sale).
The salesperson writes one invoice for each car he/she sells. Customer is issued this invoice.
A customer may be just a service center customer and does not need to be a car buyer.
One service ticket per each car is issued when it is reached to the service center.
The car a service history is maintained for each of the cars serviced. Car has a unique serial number.
One or more…
Note: solve only if you can answer it correctly . Otherwise I will dislike the answer. Thank you!!
Q. Indicate the changes you need to make to the design of the BITS database to support the following situation. There is no relationship between clients and consultants. When a client places an order (service request), it may be performed by any consultant. On the order, identify both the client placing the order and the consultant responsible for the order.
Chapter 5 Solutions
Database Concepts (7th Edition)
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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