我正在尝试创建数据库表并将它们连接起来。我确保我的数据类型是相同的。我还确保我的表格是在添加 FK 之前制作的。任何建议将不胜感激。
SQL query:
ALTER TABLE `Member` ADD FOREIGN KEY ( memberId ) REFERENCES `Order_Head` ( `memberId` ) ;
MySQL said: Documentation
#1005 - Can't create table 'test2.#sql-184c_63' (errno: 150) (Details...)
-- ---
-- Table 'Order_Head'
--
-- ---
DROP TABLE IF EXISTS `Order_Head`;
CREATE TABLE `Order_Head` (
`orderId` INTEGER NOT NULL AUTO_INCREMENT,
`memberId` INTEGER NOT NULL,
`date` DATE NOT NULL,
PRIMARY KEY (`orderId`, `memberId`)
);
-- ---
-- Table 'Member'
--
-- ---
DROP TABLE IF EXISTS `Member`;
CREATE TABLE `Member` (
`memberId` INTEGER NOT NULL AUTO_INCREMENT,
`userName` VARCHAR(50) NOT NULL,
`password` VARCHAR(50) NOT NULL,
`email` VARCHAR(100) NOT NULL,
`isAdmin` BOOLEAN NOT NULL DEFAULT false,
PRIMARY KEY (`memberId`)
);
-- ---
-- Foreign Keys
-- ---
ALTER TABLE `Member` ADD FOREIGN KEY (memberId) REFERENCES `Order_Head` (`memberId`);
-- ---
-- Table Properties
-- ---
ALTER TABLE `Order_Head` ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_bin;
ALTER TABLE `Member` ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_bin;