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What is alternate key candidate key?

Alternate keys are those Candidate keys that were not chosen to be the Primary key of the table. Composite key is a Candidate key that consists of more than one attribute. Foreign key is an attribute which is a Primary key in its parent table but is included as an attribute in the host table.


What is alternate key in SQL with example?

Alternate key is a secondary key it can be simple to understand by an example: Let's take an example of student it can contain NAME, ROLL NO., ID and CLASS. Here ROLL NO. is primary key and rest of all columns like NAME, ID and CLASS are alternate keys.

What is candidate key key?

A candidate key is a specific type of field in a relational database that can identify each unique record independently of any other data. Experts describe a candidate key of having "no redundant attributes" and being a "minimal representation of a tuple" in a relational database table.

Is candidate key Same as key?

Primary Key is a unique and non-null key which identify a record uniquely in table. A table can have only one primary key. Candidate key is also a unique key to identify a record uniquely in a table but a table can have multiple candidate keys. Primary key column value can not be null.

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