A primary key uniquely identifies a:
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A primary key is a column of table which uniquely identifies each tuple (row) in that table. Primary key enforces integrity constraints to the table. The primary key does not accept the any duplicate and NULL values. ...
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The main purpose of the primary key is to provide a means to identify each record in the table. ... The primary key enforces the entity integrity of the table. All columns defined must be defined as NOT NULL. The primary key uniquely identifies a row
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