nysql에서 외래키 참조

syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '[CONSTRAINT fk_name] FOREIGN KEY(name) REFERENCES uesr_into(name) ON UPD' at line 5 CREATE TABLE a_check( id MEDIUMINT AUTO_INCREMENT PRIMARY KEY, name MEDIUMTEXT not null, age MEDIUMINT not null, [CONSTRAINT fk_name] FOREIGN KEY(name) REFERENCES uesr_into(name) ON UPDATA CASCADE ); 무슨 에러에요? 데이터가 있어야 한다는 걸까요?