Primary Key - a field containing a value that uniquely identifies each record in a table. The primary key is unique and prevents entering duplicate records or a null value in that field. Foreign Key - a key in a related table that refers to the primary key in another table.
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Primary Key - a field containing a value that uniquely identifies each record in a table. The primary key is unique and prevents entering duplicate records or a null value in that field. Foreign Key - a key in a related table that refers to the primary key in another table.