ORA-00907:缺少右括号

Question

CREATE TABLE Persons (
  P_Id int NOT NULL,
  LastName varchar(255) NOT NULL,
  FirstName varchar(255),
  PRIMARY KEY (P_Id)
)
CREATE TABLE Orders (
  O_Id int NOT NULL PRIMARY KEY,
  OrderNo int NOT NULL,
  P_Id int FOREIGN KEY REFERENCES Persons(P_Id)
)

我得到一个错误，而创建表订单:

ORA-00907:缺少右括号

Answer 1

如果在列定义中定义外键，则不应指定foreign key。从定义中删除。

试试这个:

CREATE TABLE Orders 
( 
  O_Id int NOT NULL PRIMARY KEY, 
  OrderNo int NOT NULL,
  P_Id int REFERENCES Persons(P_Id)
)