Modern Database Management
13th Edition
ISBN: 9780134773650
Author: Hoffer
Publisher: PEARSON
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Question
Chapter 9, Problem 9.37PAE
Program Plan Intro
(a)
To design:
A star schema for the given information.
Program Plan Intro
(b)
To estimate:
The number of rows in the fact table.
Program Plan Intro
(c)
To estimate:
The total size of the fact table assuming average 15 bytes for each field.
Program Plan Intro
(d)
To find:
Another way to change the design of this data mart.
Program Plan Intro
(e)
To propose:
A design for star schema to allow the slow changes in the entities over the time.
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Query design by referring the following scenario.Scenariocompany has a huge database to handle their employees’ details.Most of the details regarding the employee activities and department details are stored in Employeestable and Departments table. Write the appropriate query to support the manager to complete thefollowing:
The set of 7 attributes is { desc, drought, price, sci, size, store, zones }
The attributes are for plants for sale at different stores
The dependencies are:
{sci, store, size} -> {price}
{sci} -> {desc, drought, zones}
"desc" is the description of the plant
"drought" is whether the plant can survive with less water
"price" is the price of the plant
"sci" is the scientific name of the plant
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"zones" indicates which climate zones the plant will grow in
What is the key for the complete set of attributes?
a. price
O b. sci, store and size
c. desc, drought and zones
d. sci
Consider the table:
STAFF_MEETING (EmployeeName, ProjectName, Date)
The rows of this table record the fact that an employee from a particular project attended a meeting on a given date. Assume that a project meets at most once per day. Also, assume that only one employee represents a given project (think of it as a project leader) but that employees can be assigned to multiple projects.
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Chapter 9 Solutions
Modern Database Management
Ch. 9 - Prob. 9.1RQCh. 9 - Prob. 9.2RQCh. 9 - Prob. 9.3RQCh. 9 - List the five major trends that necessitate data...Ch. 9 - Prob. 9.5RQCh. 9 - Prob. 9.6RQCh. 9 - Prob. 9.7RQCh. 9 - Prob. 9.8RQCh. 9 - Prob. 9.9RQCh. 9 - Prob. 9.10RQ
Ch. 9 - List four objectives of derived data.Ch. 9 - Prob. 9.12RQCh. 9 - Prob. 9.13RQCh. 9 - Explain the pros and cons of logical data marts.Ch. 9 - Prob. 9.15RQCh. 9 - What is a helper table, and why is it often used...Ch. 9 - Describe the characteristics of a surrogate key as...Ch. 9 - Prob. 9.18RQCh. 9 - What is the purpose of conformed dimensions for...Ch. 9 - Prob. 9.20RQCh. 9 - Prob. 9.21RQCh. 9 - Prob. 9.22RQCh. 9 - Prob. 9.23RQCh. 9 - Prob. 9.24RQCh. 9 - Prob. 9.25RQCh. 9 - Describe the current key trends in data...Ch. 9 - Discuss the benefits of offering data warehousing...Ch. 9 - Prob. 9.28RQCh. 9 - List six typical characteristics of reconciled...Ch. 9 - Prob. 9.30RQCh. 9 - Prob. 9.31RQCh. 9 - Prob. 9.32RQCh. 9 - Prob. 9.33RQCh. 9 - Describe some field-level and record-level data...Ch. 9 - Prob. 9.35PAECh. 9 - Prob. 9.36PAECh. 9 - Prob. 9.37PAECh. 9 - Prob. 9.38PAECh. 9 - You are to construct a star schema for Simplified...Ch. 9 - Simplified Automobile Insurance Company would like...Ch. 9 - Prob. 9.41PAECh. 9 - Prob. 9.42PAECh. 9 - Prob. 9.43PAECh. 9 - Prob. 9.45PAECh. 9 - Prob. 9.46PAECh. 9 - Prob. 9.47PAECh. 9 - Prob. 9.48PAECh. 9 - Prob. 9.49PAECh. 9 - Prob. 9.50PAECh. 9 - Prob. 9.51PAECh. 9 - Prob. 9.52PAECh. 9 - Prob. 9.53PAECh. 9 - Prob. 9.54PAE
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