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|Basic||There can be only one primary key in any relation.||There can be more than one candidate key in a relation.|
|NULL||No attribute of a Primary key can contain NULL value.||The attribute of a Candidate key can have NULL value.|
|Specify||It is optional to specify a primary key for any relation.||There can not be a relation without candidate key specified.|
|Feature||Primary key describes the most important attribute for the relation.||Candidate keys present candidates that can qualify for Primary Key.|
|Vice-Versa||A primary key is a candidate key.||But it not compulsory that each candidate key can be a primary key.|
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The Advanced Research Projects Agency Network (ARPANET)
It was an early packet switching network and the first network to implement the protocol suite TCP/IP. Both technologies became the technical foundation of the Internet.
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