Question

What do you understand by primary key with examples?​

Answer 1

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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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Answer 2

Explanation:

A primary key is either an existing table column that is specifically generated by the database according to a defined sequence

for example : students are routinely assigned uniqe id numbers , and all adults are receive govt_assigned and uniquely identifiable social security numbers

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