多個外鍵？

Question

我有一張表，應該跟蹤天和產品從一個供應商運送到另一個的成本。我們（出色地說：p）在「供應商」表中將產品處理供應商（Think ... Dunder Mifflin）與運輸供應商（FedEx，UPS）存儲在一起。所以，我的SHIPPING_DETAILS表中有三列都引用了VENDOR.no。由於某些原因，MySQL不會讓我將所有三個定義爲外鍵。有任何想法嗎？

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，以去除雙主鍵定義...

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是啊，可惜就是沒有解決它雖然。現在我越來越：

無法創建表 './ 打消了我的DB名稱 /SHIPPING_GRID.frm' （錯誤：150）

做一個phpinfo（）函數告訴我這個對MySQL：

客戶端API版本5.0.45

是的，VENDOR.no是類型int（6）。

Answer 1

您定義了兩次主鍵。嘗試：

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主鍵必須是INT（6），並且這兩個表必須是InnoDB類型。

Answer 2

我在這裏運行代碼，並顯示錯誤消息（它是正確的！），您設置ID字段兩次作爲主鍵。

Answer 3

你能提供 賣方表

我理解了它的定義。供應商表是MyISAM的...（編輯你的答案告訴我，使他們既INNODB;））

（任何原因不只是開關供應商類型超過InnoDB的）