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Primary Key
About the term Primary key
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A primary key is a single field or combination of fields that uniquely defines a record. ... In Oracle, a primary key can not contain more than 32 columns. ...
http://www.techonthenet.com/oracle/primary_keys.php
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The primary key is an attribute (or a combination of attributes) that uniquely identifies a row. Though not strictly required by relational mathematics, ...
http://immike.net/blog/2007/08/14/database-design-choosing-a-primary-key/
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Listing added: Apr 8, 2008)
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Mar 7, 2002 ... What is a primary key VB Classic. ... I know what a primary key is, but what is the difference between a primary key and a unique clustered ...
http://forums.devx.com/showthread.php?t=47603
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Choosing a primary key is one of the most important steps in good database design. A primary key is a table column that serves a special purpose. ...
http://www.sqlmag.com/Article/ArticleID/5113/sql_server_5113.html
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This information is called the primary key of the table. Once you designate a primary key for a table, to ensure uniqueness, MySQL will prevent any ...
http://help.scibit.com/Mascon/masconWhat_kind_of_primary_key_should_.html
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A model with composite primary keys would look like� class Membership < ActiveRecord::Base # set_primary_keys *keys - turns on composite key functionality ...
http://compositekeys.rubyforge.org/
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Feb 24, 2008 ... It seemed to me that if you take a BIPAD, and issue number, and a volume year, you have a pretty good choice for a natural primary key. ...
http://database-programmer.blogspot.com/2008/02/primary-key-that-wasnt.html
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Listing added: Apr 8, 2008)
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