When multiple fields are used to identify a record,it is a composite key,which is sometimes referred to as a concatenated key.

Name: When multiple fields are used to identify a record,it is a composite key,which is sometimes referred to as a concatenated key.
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A composite key is a combination of two or more columns in a table that can be used to uniquely identify each row in the table. It is also known as a concatenated key.

When Multiple Fields Are Used to Identify a Record,it Is