SQL Foreign Key Explained! What is a Foreign Key in Databases?

This SQL foreign key video will walk you through the concepts of a primary key in any database management system.

This sql tutorial will tell you that a sql foreign key is a frequent guest in the house of database management systems no matter if you find yourself using MySQL, PostgreSQL, or SQL Server.

In the context of databases, a foreign key refers to any column in a table that is linked to a column in a different table. Usually, that is a field in the table A that refers to a field with a PRIMARY KEY in the table B.

Foreign keys can be implemented upon table creation or by altering a table that is already created.

The syntax to create foreign keys differs depending on what database management system is in use.

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