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Asked On2019-05-18 10:28:48 by:ShwetaMerchant

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Fututronaksingh1818

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superkey is a combination of attributes that can be uniquely used to identify a database record. A table might have many superkeys. Candidate keys are a special subset of superkeys that do not have any extraneous information in them.

Example for super key: Imagine a table with the fields <Name><Age><SSN> and <Phone Extension>. This table has many possible superkeys. Three of these are <SSN><Phone Extension, Name> and <SSN, Name>. Of those listed, only <SSN> is a candidate key, as the others contain information not necessary to uniquely identify records.

Primary Key The attribute or combination of attributes that uniquely identifies a row or record in a relation is known as primary key.

Candidate Key or Alternate key A relation can have only one primary key. It may contain many fields or combination of fields that can be used as primary key. One field or combination of fields is used as primary key. The fields or combination of fields that are not used as primary key are known as candidate key or alternate key.

Foreign Key A foreign key is an attribute or combination of attribute in a relation whose value match a primary key in another relation. The table in which foreign key is created is called as dependent table. The table to which foreign key is refers is known as parent table.


Answerd on:2019-05-24 Answerd By:Jaynil-Gaglani

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