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 ...
In MySQL, the PRIMARY KEY constraint is used to uniquely identify each record in a table. Primary key contains UNIQUE values only and the column defined as Primary key column can not be NULL. A table ...
ALTER TABLE `messages` ADD CONSTRAINT `user_id` FOREIGN KEY (`user_id`) REFERENCES `users` (`user_id`); ALTER TABLE `channel_details` ADD CONSTRAINT `user_id` FOREIGN KEY (`user_id`) REFERENCES ...
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