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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...
