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  • [LeetCode#177]Nth Highest Salary

    Write a SQL query to get the nth highest salary from the Employee table.
    
    +----+--------+
    | Id | Salary |
    +----+--------+
    | 1  | 100    |
    | 2  | 200    |
    | 3  | 300    |
    +----+--------+
    For example, given the above Employee table, the nth highest salary where n = 2 is 200. If there is no nth highest salary, then the query should return null.
    
    +------------------------+
    | getNthHighestSalary(2) |
    +------------------------+
    | 200                    |
    +------------------------+
    

    解法一:

    CREATE FUNCTION getNthHighestSalary(N INT) RETURNS INT
    BEGIN
      SET N = N - 1;
      RETURN (
          SELECT DISTINCT Salary FROM Employee GROUP BY Salary
          ORDER BY Salary DESC LIMIT 1 OFFSET N
      );
    END

    解法二:

    CREATE FUNCTION getNthHighestSalary(N INT) RETURNS INT
    BEGIN
      RETURN (
          SELECT MAX(Salary) FROM Employee E1
          WHERE N =
          (SELECT COUNT(DISTINCT(E2.Salary)) FROM Employee E2
          WHERE E2.Salary >= E1.Salary)
      );
    END

     解法三:

    CREATE FUNCTION getNthHighestSalary(N INT) RETURNS INT
    BEGIN
      RETURN (
          SELECT MAX(Salary) FROM Employee E1
          WHERE N - 1 =
          (SELECT COUNT(DISTINCT(E2.Salary)) FROM Employee E2
          WHERE E2.Salary > E1.Salary)
      );
    END
                  
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  • 原文地址:https://www.cnblogs.com/lsyb-python/p/11011216.html
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