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What is FOREIGN KEY Constraint in MySQL?

Note that the "P_Id" column in the "Orders" table points to the "P_Id" column in the "Persons" table. In MySQL, the FOREIGN KEY on one table is used to point a PRIMARY KEY in another table. We have two tables with the following values. ...

How to add foreign key contraint to a column in MySql?

In many cases we need to create foreign key in a table. We can do this at the time of table creation and after the table creation by ALTER command. 1- At the time of table creation: CREATE TABLE user_device ( id int(11) NOT NULL AUTO...
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