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What is a candidate key?

Answer Posted / sivakumar

A candidate key is a combination of attributes that can be
uniquely used to identify a database record without any
extraneous data(unique).One of these candidate keys is selected as
the table primary key else are called Alternate Key. Each table may have one or more
candidate keys. One of these candidate keys is selected as
the table primary key else are called Alternate Key.

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