SQL Server interview questions and answers: – What is the difference between Candidate Key, Primary Key, and Alternate Key?

Candidate Key

  • It is a column or group of column which can uniquely identify values in the table.
  • There might be more than one candidate key in one table.

What’s next?
In case table has multiple Candidate keysa column,

  • Which will never going to have Null value and
  • Whose values will rarely get changed is chosen.

And we make that column Primary Key?

Now the candidate key columns which are not Primary key are called Alternate keys.

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