The primary key is a combination of fields which uniquely specify a row. This is a special kind of unique key and it has an implicit, NOT NULL constraint. This means Primary key values cannot be NULL.
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What is a primary key?
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06-Apr-2019The primary key is a combination of fields which uniquely specify a row. This is a special kind of unique key and it has an implicit, NOT NULL constraint. This means Primary key values cannot be NULL.