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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