Question

我在使用此代码时遇到了问题：

CREATE TABLE Department (
  Department_ID INTEGER PRIMARY KEY NOT NULL,
  Department_Name CHAR(15) NOT NULL,
  Department_Location CHAR(13) NOT NULL,
  Department_Phone_Number INTEGER NOT NULL,
  CONSTRAINT fk_Employee
  FOREIGN KEY (Employee_ID)
  REFERENCES Employee(Employee_ID)
);

我收到ORA-00904: "EMPLOYEE_ID": invalid identifier错误，但我已经使用以下代码创建了一个员工表：

CREATE TABLE Employee (
  Employee_ID INTEGER PRIMARY KEY NOT NULL,
  Employee_Name CHAR(25) NOT NULL,
  Date_Of_Birth DATE NOT NULL,
  Job_Title CHAR (15) NOT NULL,
  Marriage_Date DATE NULL,
  Spouse_Name CHAR(25) NULL
);

对我做错了什么的想法？

Answer 1

你需要有Employee_id列，你也可以在你的Department表中定义外键：

CREATE TABLE Department
(Department_ID integer PRIMARY KEY NOT NULL,
Department_Name CHAR(15) NOT NULL,
Department_Location CHAR(13) NOT NULL,
Department_Phone_Number integer NOT NULL,
Employee_ID integer null,
CONSTRAINT fk_Employee
FOREIGN KEY (Employee_ID)
REFERENCES Employee(Employee_ID));

Answer 2

我认为在dedepartment表中没有EMPLOYEE_ID列。首先在department表中创建一个列，然后引用employee表的外键

获取ORA-00904无效标识符错误，但已创建标识符

2 个答案: