Question

what is primary key........​

Answer 1

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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Answer 2

Answer:

A unique key used in the database....

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