题
我有一张表,用于跟踪将产品从一个供应商运送到另一个供应商的天数和成本。我们(非常出色:p)将运输供应商(FedEx、UPS)与产品处理供应商(想想...Dunder Mifflin)位于“VENDOR”表中。因此,我的 SHIPPING_DETAILS 表中有三列,全部引用 VENDOR.no。由于某种原因,MySQL 不允许我将这三个都定义为外键。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;
编辑以删除双主键定义...
是的,不幸的是,这并没有解决问题。现在我得到:
无法创建表'./删除了我的数据库名称/shipping_grid.frm'(errno:150)
执行 phpinfo() 告诉我 mysql 的情况:
客户端 API 版本 5.0.45
是的,VENDOR.no 的类型是 int(6)。
解决方案
您定义了主键两次。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。
其他提示
我在这里运行了代码,错误消息显示(这是正确的!)您正在设置 ID 字段作为主键的两倍。
您能提供供应商表的定义吗
我想到了。VENDOR 表是 MyISAM...(编辑你的答案告诉我让它们都是 INNODB ;))
(任何原因 不是 只是将 VENDOR 类型切换为 INNODB?)
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