pl/sql 绑定错误

Question

谁能帮我写下下面的代码：

1. 不知道为什么会报错
2. RETURN (salary > min_sal) & (salary <=Max sal) - 这些有效吗？

当我运行代码时，我得到一个PLS 00049 BAD BIND error

Create or REPLACE FUNCTION sal_ok(SALARY number, jobgrade NUMBER)
RETURN BOOLEAN AS
BEGIN
SELECT losal, hisal INTO :min_sal, :max_sal FROM salgrade
WHERE grade = jobgrade;
RETURN (salary >=min_sal) AND  (salary <=Max sal);
END sal_ok;
/

感谢您的帮助

Answer 1

出现严重绑定错误的原因是您没有在函数中的任何位置声明 min_sal 和 max_sal 变量。

照做

CREATE OR REPLACE FUNCTION sal_ok (salary NUMBER, jobgrade NUMBER)
    RETURN BOOLEAN
AS
min_sal number;
max_sal number;
BEGIN
    SELECT  losal, hisal
      INTO  min_sal, max_sal
      FROM  salgrade
     WHERE  grade = jobgrade;

    RETURN (salary >= min_sal) AND (salary <= max_sal); -- not sure about this line as   I am not sure what you would want to return
END sal_ok;
/

这将消除您的错误绑定错误。

关于你的 return 声明，我不确定你想从你的函数中返回什么。