ALTER TABLE `sections` ADD CONSTRAINT `FK_course_id` FOREIGN KEY (`Course_id`) REFERENCES `courses`(`id`) ON DELETE CASCADE ON UPDATE CASCADE code example

Example: update foreign key value in mysql

SET foreign_key_checks = 0;
UPDATE languages SET id='xyz' WHERE id='abc';
UPDATE categories_languages SET language_id='xyz' WHERE language_id='abc';
SET foreign_key_checks = 1;