Question

Unique identifier made up of more than one attribute is called a

Answer 1

Sometimes it requires more than one attribute to uniquely identify an entity. A primary key that made up of more than one attribute is known as a composite key. ... Each instance of the entity Work can be uniquely identified only by a composite key composed of Employee ID and Project ID

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Answer 2

Unique identifier made up of more than ‘one attribute’ is called as composite key.

Explanation:

• Primary keys and foreign keys are the basic components in a database theory. Primary keys are unique identifiers that enforce entity integrity.  

• Foreign keys impose referential integrity. Composite keys are the keys which require more than one attribute that uniquely identify an entity.  

• In other words, a primary key which has been made up of more than one attribute can be known as composite key.

• For example, Employee_Id and Project_Id can be joined together known as composite key.

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