The primary key is used both to identify unique rows in a relation and to represent rows in relationships.

Name: The primary key is used both to identify unique rows in a relation and to represent rows in relationships.
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The primary key is a unique identifier for each row in a relation and is used to enforce integrity constraints and relationships between tables. It is used to identify rows in a relation and can also be referenced in relationships between tables.

The Primary Key Is Used Both to Identify Unique Rows