Question

对不起，对您的帮助我们深表感谢。我不断收到这种“关键字“ ON”附近的语法不正确”的信息。这是我的密码

代码一

CREATE TABLE supplier (
supplierID INT PRIMARY KEY,
ISBN INT FOREIGN KEY REFERENCES book(ISBN),
price DECIMAL (5,2),
ON UPDATE CASCADE,
ON DELETE CASCADE,
);

代码二

CREATE TABLE orders (
orderID INT PRIMARY KEY,
customerID INT FOREIGN KEY REFERENCES customer(customerID),
ISBN INT FOREIGN KEY REFERENCES book(ISBN),
orderDate date,
ON UPDATE CASCADE,
ON DELETE CASCADE,
);

我已经用光了东西，除了将其愚弄成无用之物。

Answer 1

ON UPDATE和ON DELETE应该位于外键定义之外，而不是远离外键定义。另外，每个外键定义都将具有自己的ON UPDATE和ON DELETE定义。

CREATE TABLE supplier (
supplierID INT PRIMARY KEY,
ISBN INT FOREIGN KEY REFERENCES book(ISBN) 
  ON UPDATE CASCADE 
  ON DELETE CASCADE,
price DECIMAL (5,2)
);


CREATE TABLE orders (
orderID INT PRIMARY KEY,
customerID INT FOREIGN KEY REFERENCES customer(customerID)
  ON UPDATE CASCADE
  ON DELETE CASCADE,
ISBN INT FOREIGN KEY REFERENCES book(ISBN)
  ON UPDATE CASCADE
  ON DELETE CASCADE,
orderDate date
);

“关键字'ON'附近的语法不正确。（在更新级联上，在删除级联上，）

1 个答案: