谁能告诉我这里有什么问题？

Question

谁能告诉我这里有什么问题？

从命令行中的第15行开始出错 -

CREATE TABLE USERINSC521SP18_EAA52.EmployeePhone
(
    EmployeeID int,
    EmployeePhone varchar(30) NOT NULL,
    Primary key (EmployeeID),
    EmployeeID int REFERENCES Employee(EmployeeID) on DELETE NO ACTION
)

错误：

  

ORA-00957：重复列名称
  00957. 00000 - “重复列名”

     

*原因：
  *行动：

Answer 1

你似乎想要：

CREATE TABLE USERINSC521SP18_EAA52.EmployeePhone (
    EmployeeID int primary key references Employee(EmployeeID) on DELETE NO ACTION,
    EmployeePhone varchar(30) NOT NULL
);

但为什么不将EmployeePhone存储在Employee？

Answer 2

应：

EmployeeID int REFERENCES Employee(EmployeeID) on DELETE NO ACTION)

是，

FOREIGN KEY(EmployeeID) REFERENCES Employee(EmployeeID) on DELETE NO ACTION)