Multiple choice

A primary key made of more than one column (multi column) is called

  1. foreign key

  2. duplicate key

  3. alternate key

  4. composite key
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

A composite key is a primary key that consists of two or more columns used together to uniquely identify each record in a table. A foreign key references another table's primary key, an alternate key is a candidate key not chosen as primary key, and 'duplicate key' is not a standard database term.

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