Question

A primary key is a unique record identifier??

Answer 1

Answer:

• In the relational model of databases, a primary key is a specific choice of a minimal set of attributes (columns) that uniquely specify a tuple (row) in a relation (table). Informally, a primary key is "which attributes identify a record", and in simple cases are simply a single attribute: a unique id.

Answer 2

A primary key is a unique identifier for a database record. When a table is created, one of the fields is typically assigned as the primary key. ... It also helps relate records across multiple tables. Therefore, while multiple fields within a table can be defined as "Unique," each table can only have one primary key.

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