ALTER TABLE `fd_rel_customer_doctor`
ADD CONSTRAINT `FK_fd_rel_customer_doctor_1` FOREIGN KEY (`CUSTOMER_USER_ID`) REFERENCES `fd_customer_user` (`CUSTOMER_USER_ID`),
ADD CONSTRAINT `FK_fd_rel_customer_doctor_2` FOREIGN KEY (`DOCTOR_ID`) REFERENCES `fd_doctor` (`DOCTOR_ID`);

mysql foreign key 外键