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
Repeating groups
 ,QWURGXFWLRQ
One of the properties of a normalised table, as defined in Chapter 3, is that an attribute
must have only one value in each row. The present chapter looks more closely at the
reasons for this rule, and then discusses ways in which tables may be structured so that
the rule is obeyed.
What constitutes a single value for an attribute? Suppose partNo values are defined
as two-character codes, the first character being alphabetic (not necessarily a P, as used
in the examples) and the second character numeric. Each two-character code
represents a part that may be supplied by a supplier. In Fig. 5. 1a, row 1 contains a single ...
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