Question

CREATE FUNCTION Salary.SecondHighestSalary()

Returns int

AS 

    BEGIN
    Declare @salary int;

  SELECT TOP 1 salary FROM (

  SELECT TOP 2 salary FROM Salary
  ORDER BY salary DESC
) as maxsalary ORDER BY salary ASC

Return @salary  
END

大家好，我正在尝试使用上面的语法创建一个获得第二高工资的sql函数，但是我收到了错误：

“选择函数中包含的语句无法将数据返回给客户端。”

任何人都可以告诉我编写函数的实际语法是什么，或者只是用正确的语法将代码转回来。提前谢谢。

Answer 1

我写的是使用ROW_NUMBER()，如下所示：

CREATE FUNCTION SecondHighestSalary()

Returns int

AS 
begin
    Return (
      select salary from (
         select salary,ROW_NUMBER() OVER (ORDER BY salary desc) as rn
         from Salary
        ) t
      where rn = 2);
END

如果你需要处理例如，这也可以很容易地进行调整。联系{切换为RANK或DENSE_RANK，视情况而定）TOP和ORDER BY方法不适合。

Answer 2

CREATE FUNCTION Salary.SecondHighestSalary()

Returns int

AS 

    BEGIN
    Declare @salary int;

  SELECT TOP 1 @salary = salary FROM (

  SELECT TOP 2 salary FROM Salary
  ORDER BY salary DESC
) as maxsalary ORDER BY salary ASC

Return @salary  
END

在sql中创建函数时出错

2 个答案: