check constraint won't work mysql [duplicate]

Answer 1

Unfortunately MySQL does not support SQL check constraints. So try using enum instead

CREATE TABLE IF NOT EXISTS supervisor (
sup_id INT(3) NOT NULL,
sup_name VARCHAR(30) NOT NULL,
gen enum('M','F') NOT NULL,
dep_id INT(4),

PRIMARY KEY (sup_id),
INDEX (dep_id),

FOREIGN KEY (dep_id)
    REFERENCES department(dep_id)
    ON UPDATE CASCADE ON DELETE RESTRICT    
);