Skip to Main Content
Data Analysis for Database Design, 3rd Edition
book

Data Analysis for Database Design, 3rd Edition

by David Howe
May 2001
Intermediate to advanced content levelIntermediate to advanced
336 pages
14h 36m
English
Butterworth-Heinemann
Content preview from Data Analysis for Database Design, 3rd Edition
telephoneExtensionNo is adequate because they cannot determine employeeNo, there
being several employees per room and per extension.
5. (a)
(b) The only candidate identifier is {employeeNo, telephoneExtensionNo};
employeeNo alone is no longer sufficient (compare 4(b)) because the same
employeeNo may occur in several rows of the table, each occurrence being associated
with a different telephoneExtensionNo.
6. Consultant (consultantNo, consultantName)
Project (projectNo, projectTitle)
ConsultantProject (consultantNo, projectNo)
A consultant who is not assigned to any project will appear in Consultant but not in
ConsultantProject. Similarly, a project that ...
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Start your free trial

You might also like

Data Quality Engineering in Financial Services

Data Quality Engineering in Financial Services

Brian Buzzelli

Publisher Resources

ISBN: 9780750650861