What is a Primary Key? (Database) #shorts #sql

This SQL tutorial for beginners will walk you through what is a SQL primary key.
Usually, the explanation for this is not that hard - a primary key in a database is a unique kind of SQL index that uniquely identify a row in a table.

The usual definition of a SQL primary key refers to it being an attribute that identifies a record, and these days, primary keys are usually used together with the AUTO_INCREMENT feature so that the rows added to a table could have an auto-incrementing ID associated with them. Here's a MySQL Server-based example:

CREATE TABLE `pk_example` (
`id` INT(12) NOT NULL AUTO_INCREMENT PRIMARY KEY,
...
) ENGINE = InnoDB;

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