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  • leetcode_sql_1,176,177

    1、176题目,Second Highest Salary,https://leetcode.com/problems/second-highest-salary/#/description

      Write a SQL query to get the second highest salary from the Employee table.

    +----+--------+
    | Id | Salary |
    +----+--------+
    | 1  | 100    |
    | 2  | 200    |
    | 3  | 300    |
    +----+--------+
    

      For example, given the above Employee table, the query should return 200 as the second highest salary. If there is no second highest salary, then the query should return null.

    +---------------------+
    | SecondHighestSalary |
    +---------------------+
    | 200                 |
    +---------------------+

    select (
      select distinct Salary from Employee order by Salary Desc limit 1 offset 1
    )as second;
    ————————————————————————————————————————
    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                    |
    +------------------------+

    CREATE FUNCTION getNthHighestSalary(N INT)

    RETURNS INT

    BEGIN

    DECLARE M INT;

    SET M=N-1;

      RETURN (

        SELECT DISTINCT Salary FROM Employee ORDER BY Salary DESC LIMIT M, 1]

    );

    END

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  • 原文地址:https://www.cnblogs.com/coskaka/p/7113240.html
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