1072-表中不存在键列'trax_zone_id'

Question

这是父表

CREATE TABLE trax_zone(
    trax_zone_id INT(11) NOT NULL AUTO_INCREMENT PRIMARY KEY,
    trax_zone_name VARCHAR(255) NOT NULL,

)ENGINE=InnoDB;

这是子表代码

CREATE TABLE city(
    city_id INT(11) NOT NULL AUTO_INCREMENT PRIMARY KEY,
    city_name VARCHAR(255) NOT NULL,
    FOREIGN KEY fk_trax(trax_zone_id) REFERENCES trax_zone(trax_zone_id) ON UPDATE CASCADE ON DELETE RESTRICT,
    FOREIGN KEY fk_zoop(zoop_zone_id) REFERENCES zoop_zone(zoop_zone_id) ON UPDATE CASCADE ON DELETE RESTRICT   
)ENGINE=InnoDB;

我是mysql的新手，请指导我