mysql foreign key example create table

Example 1: drop foreign key

ALTER TABLE table_name
DROP CONSTRAINT fk_name;

Example 2: alter table add column forigen key mysql

ALTER TABLE tryholpz_demo07.core_modules 
ADD COLUMN belongs_to_role INT, 
ADD FOREIGN KEY core_modules(belongs_to_role) REFERENCES role_specific_modules_info(id) ON DELETE CASCADE