Question

 CREATE TABLE `ROUTE` (
  `route_ID` INT NOT NULL,
  `route_name` VARCHAR(45) NOT NULL,
  `DELIVERY_VEHICLE_veh_ID` INT NOT NULL,
  `DELIVERY_DRIVER_dr_ID` INT NOT NULL,
  PRIMARY KEY (`route_ID`),
  CONSTRAINT `fk_ROUTE_DELIVERY1`
    FOREIGN KEY (`DELIVERY_VEHICLE_veh_ID` , `DELIVERY_DRIVER_dr_ID`)
    (`VEHICLE_veh_ID` , `DRIVER_dr_ID`)
    ON DELETE NO ACTION
    ON UPDATE NO ACTION);

我是SQL的新手，并试图通过练习来学习。我的语法中有一个我不理解的错误。任何帮助/建议？

（VEHICLE_veh_ID，DRIVER_dr_ID）第9行

CREATE TABLE `DRIVER` (
  `dr_ID` INT NOT NULL,
  `dr_title` VARCHAR(15) NOT NULL,
  `dr_fname` VARCHAR(45) NOT NULL,
  `dr_lname` VARCHAR(45) NOT NULL,
  `dr_DOB` DATETIME NOT NULL,
  `dr_licenceNo` VARCHAR(45) NOT NULL,
  `dr_phone` VARCHAR(15) NOT NULL,
  `dr_email` VARCHAR(45) NOT NULL,
  PRIMARY KEY (`dr_ID`));

CREATE TABLE `VEHICLE` (
  `veh_ID` INT NOT NULL,
  `veh_reg` VARCHAR(15) NOT NULL,
  `veh_make` VARCHAR(45) NOT NULL,
  `veh_model` VARCHAR(45) NOT NULL,
  `veh_mileage` INT NOT NULL,
  `veh_MOTdate` DATETIME NOT NULL,
  `veh_servicedate` DATETIME NOT NULL,
  PRIMARY KEY (`veh_ID`));

这些是与ROUTE相关的其他表格。我没有把DRIVER和VEHICLE表插入数据库的问题，ROUTE出了什么问题？

Answer 1

看起来typeAheadId_1表中有两个外键。

其中一个引用了ROUTE表。

另一个引用DRIVER表。

您的外键约束定义应该更像这样：

VEHICLE

Answer 2

CREATE TABLE `ROUTE` (
  `route_ID` INT NOT NULL,
  `route_name` VARCHAR(45) NOT NULL,
  `DELIVERY_VEHICLE_veh_ID` INT NOT NULL,
  `DELIVERY_DRIVER_dr_ID` INT NOT NULL,
  PRIMARY KEY (`route_ID`),
  CONSTRAINT `fk_ROUTE_VEHICLE`
    FOREIGN KEY (`DELIVERY_VEHICLE_veh_ID`)
    REFERENCES `VEHICLE`(`veh_ID`)
    ON DELETE NO ACTION
    ON UPDATE NO ACTION,

    CONSTRAINT `fk_ROUTE_DRIVER`
    FOREIGN KEY (`DELIVERY_DRIVER_dr_ID`)
    REFERENCES `DRIVER`(`dr_ID`)
    ON DELETE NO ACTION
    ON UPDATE NO ACTION);

SQL新增功能，CREATE TABLE错误

2 个答案: