Question

I’ve got a table that is supposed to track days and costs for shipping product from one vendor to another. We (brilliantly :p) stored both the shipping vendors (FedEx, UPS) with the product handling vendors (Think… Dunder Mifflin) in a ‘VENDOR’ table. So, I have three columns in my SHIPPING_DETAILS table that all reference VENDOR.no. For some reason MySQL isn’t letting me define all three as foreign keys. Any ideas?

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; 

Edited to remove double primary key definition…

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Yeah, unfortunately that didn’t fix it though. Now I’m getting:

Can’t create table ‘./REMOVED MY DB NAME/SHIPPING_GRID.frm’ (errno: 150)

Doing a phpinfo() tells me this for mysql:

Client API version 5.0.45

Yes, the VENDOR.no is type int(6).

Answer 1

You defined the primary key twice. Try:

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; 

The VENDOR primary key must be INT(6), and both tables must be of type InnoDB.