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What Is Primary Key? |
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Answer» A PRIMARY KEY constraint is a unique IDENTIFIER for a ROW within a database table. EVERY table should have a primary key constraint to uniquely identify each row and only one primary key constraint can be created for each table. The primary key constraints are used to ENFORCE entity integrity. A PRIMARY KEY constraint is a unique identifier for a row within a database table. Every table should have a primary key constraint to uniquely identify each row and only one primary key constraint can be created for each table. The primary key constraints are used to enforce entity integrity. |
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