The Relational Model for Database Management: Version 2 by E. F. Codd

By E. F. Codd

Written by way of the originator of the relational version, this publication covers the sensible features of the layout of relational databases. the writer defines twelve ideas that database administration platforms have to keep on with in an effort to be defined as really relational after which provides the incentive in the back of those ideas. This booklet is an ideal source for college kids and execs within the box. 0201141922B04062001

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8 • K e y s a n d Referential Integrity The term "key" has been used in the computing field for a long time, and with a great variety of meanings. In the relational model the term is normally qualified by the adjectives "candidate," "primary," and "foreign," and each of these phrases has a precisely defined meaning. Each base R-table has exactly one primary key. , it distinguishes that row from every other row in that R-table); • if the primary key is composite and if one of the columns is dropped from the primary key, the first property is no longer guaranteed.

10 Are duplicate rows needed in a relation? If so, what for? Supply an example. Should duplicate rows be allowed in any relation? State reasons whyor why not, whichever is applicable, and supply examples. g,, currency values) can occur in any column? Explain. 8 • CHAPTER 2• Structure-Oriented and Data-Oriented Features Chapters 2 through 25 describe and explain the 333 features of RM/V2. In this chapter attention is focused on the way a relational database is structured and how the information in various parts of the database is inter-related.

Describe an application that illustrates that there is a practical need for this concept. 6 Are either of the following statements true about the structures of the relational model? They are merely flat files. They are merely tables. In each case, if your answer is no, give an example of a fiat file that is not a relation or an example of a table that is not a relation. 7 • Introduction to Version 2 of the Relational Model What is Chapter for your Exercise your position on the object-oriented approach?

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