Question

我正在构建数据库并且已经成功创建了2个主键表，但是当我尝试将它们作为2个外键引入另一个表时，我遇到了

＆＃34;客户端ID＆＃34;无效的标识符

不确定如何解决这个问题并不是最好的。

CREATE TABLE Booking(
  BookingID number(10) NOT NULL,
  CONSTRAINT Client_FK FOREIGN KEY (ClientID) REFERENCES client (ClientID),
  CONSTRAINT Course_FK FOREIGN KEY (CourseID) REFERENCES course (CourseID),
  CONSTRAINT Booking_PK PRIMARY KEY (ClientID, CourseID)
);

Answer 1

您缺少创建主键和外键的列;您需要以下内容，使用适合您的列的类型进行编辑：

CREATE TABLE Booking(
  BookingID number(10) NOT NULL,
  ClientId number,  -- missing
  CourseID number,  -- missing
  CONSTRAINT Client_FK FOREIGN KEY (ClientID) REFERENCES client (ClientID),
  CONSTRAINT Course_FK FOREIGN KEY (CourseID) REFERENCES course (CourseID),
  CONSTRAINT Booking_PK PRIMARY KEY (ClientID, CourseID)
)

来自2个外键

1 个答案: