definition of primary key
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A primary key, also called a primary keyword, is a key in a relational database that is unique for each record. It is a unique identifier, such as a driver license number, telephone number (including area code), or vehicle identification number (VIN). A relational database must always have one and only one primary key.
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A primary key is the unique identifier for each row in the database or a table. The importance of primary key is to quickly fetch the information in the database without any duplicacy or any other issue.
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