您定义了两次主键。尝试：
CREATE TABLE SHIPPING_GRID( id INT NOT NULL AUTO_INCREMENT PRIMARY KEY COMMENT 'Unique ID for each row', shipping_vendor_no INT(6) NOT NULL COMMENT 'Foreign key to VENDOR.no for the shipping vendor (vendors_type must be 3)', start_vendor_no INT(6) NOT NULL COMMENT 'Foreign key to VENDOR.no for the vendor being shipped from', end_vendor_no INT(6) NOT NULL COMMENT 'Foreign key to the VENDOR.no for the vendor being shipped to', shipment_duration INT(1) DEFAULT 1 COMMENT 'Duration in whole days shipment will take', price FLOAT(5,5) NOT NULL COMMENT 'Price in US dollars per shipment lbs (down to 5 decimal places)', is_flat_rate TINYINT(1) DEFAULT 0 COMMENT '1 if is flat rate regardless of weight, 0 if price is by lbs', INDEX (shipping_vendor_no), INDEX (start_vendor_no), INDEX (end_vendor_no), FOREIGN KEY (shipping_vendor_no) REFERENCES VENDOR (no), FOREIGN KEY (start_vendor_no) REFERENCES VENDOR (no), FOREIGN KEY (end_vendor_no) REFERENCES VENDOR (no) ) TYPE = INNODB;
VENDOR主键必须是INT（6），并且两个表都必须是InnoDB类型。
