What is 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 a column -- or a group of columns -- in a table that uniquely identifies the rows in that table. For example, in the table below, Customer No, which displays the ID number assigned to different customers, is the primary key.
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