Topic: A Primary Key
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What is a Primary Key?
In a table, the primary key or unique key uniquely identifies a record or or row. It is the first field in a record and can be accessed by foreign keys. Look here for more information: http://en.wikipedia.org/wiki/Primary_key... Read More »
Source: http://answers.ask.com/Computers/Other/what_is_a_primary_key
How to Edit the Primary Key
Having the knowledge on how to edit a column with a primary key constraint can save you time when working with a Microsoft Access database. Rows in a table are uniquely identified using a primary key constraint for data integrity. Access cr... Read More »
Source: http://www.ehow.com/how_8008154_edit-primary-key.html
How to Identify a Primary Key
Databases hold one or more tables of raw data separated into different categories, and it's these categories that are the database attributes. Each table in the database will have its own primary key that uniquely identifies a set of record... Read More »
Source: http://www.ehow.com/how_6896960_identify-primary-key.html
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A Primary Key
A primary key is the column or collection of columns that uniquely identifies a given row in a table. The primary key provides an important way of distinguishing one row from another. Underlining the… More »
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More Common Questions
Answers to Other Common Questions
Primary keys are an important part of a database table to improve performance. They are unique fields that are a part of record information, or they can be separate identities such as an incremental integer. Primary keys ensure that every r...
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Source: http://www.ehow.com/how_5100772_create-primary-key.html
In Relational Database Management System (RDBMS), a primary key (PK) is one of the many types of keys used in defining a database table. It serves as a unique identifier for every record in a table and ensures that the information stored is...
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Source: http://www.ehow.com/how_5891862_select-primary-key.html
The purpose of a primary key is to have one and only one set of data in a table with a unique key selection value. Relational database tables and VSAM (Virtual Storage Access Method) key sequenced data sets only have one primary key. Althou...
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Source: http://www.ehow.com/how_6318268_change-primary-key.html
Primary keys provide tables with a column that identifies each record as unique. Primary keys are also sorted by the table, which makes retrieval of the data quicker for web or desktop applications. Primary keys must always be unique, so de...
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Source: http://www.ehow.com/how_6123928_remove-primary-key.html
The primary key in a database table gives each record its own personal identifier that does not match in any other way with any of the other records. This guarantees the integrity of the data in the database. Records do not get mixed up out...
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Source: http://www.ehow.com/how_6897834_update-primary-key-field.html
Multiple primary keys in a SQL Server database is called a "composite key." Many times, database developers create one primary key. This key is a unique field that helps the database server sort records and retrieve them more quickly. In so...
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Source: http://www.ehow.com/how_5867408_set-multiple-primary-keys.html?re...
