Akamai Interview Question for Software Engineer / Developers


Country: India




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Candidate Key

A candidate key is a combination of attributes that can be uniquely used to identify a database record without any extraneous data. Each table may have one or more candidate keys. In general, one of these candidate keys is selected as the table primary key.



Superkey

A 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.

A primary key is therefore a minimum superkey.


Composite Key

A primary key that made up of more than one attribute is known as a composite key.

- Madhav September 18, 2011 | Flag Reply
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super key: Entire row in a table is called a super key

candidate keys: All the attributes which can be choosen as a primary key is called candidate keys these keys can uniquely identify the row

primary key: its one among the candidate key which is choosen as a primary key used to identify a row uniquely

ip a primary key composed of more than one attribyte its called as a composite key

- Anonymous August 04, 2012 | Flag Reply


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