多个外键？

Question

我有一张表，应该跟踪天和产品从一个供应商运送到另一个的成本。我们（出色地说：p）在“供应商”表中将产品处理供应商（Think ... Dunder Mifflin）与运输供应商（FedEx，UPS）存储在一起。所以，我的SHIPPING_DETAILS表中有三列都引用了VENDOR.no。由于某些原因，MySQL不会让我将所有三个定义为外键。有任何想法吗？

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; 

修改，以去除双主键定义...

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是啊，可惜就是没有解决它虽然。现在我越来越：

无法创建表 './ 打消了我的DB名称 /SHIPPING_GRID.frm' （错误：150）

做一个phpinfo（）函数告诉我这个对MySQL：

客户端API版本5.0.45

是的，VENDOR.no是类型int（6）。

Answer 1

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），并且这两个表必须是InnoDB类型。

Answer 2

我在这里运行代码，并显示错误消息（它是正确的！），您设置ID字段两次作为主键。

Answer 3

你能提供 卖方表

我理解了它的定义。供应商表是MyISAM的...（编辑你的答案告诉我，使他们既INNODB;））

（任何原因不只是开关供应商类型超过InnoDB的）