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  • LeetCode SQL: Second Highest Salary

    select if(count(salary) = 0, NULL, salary) as `salary` from (
    select salary from Employee  group by salary order by salary desc limit 1,1) tmp

    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 second highest salary is 200. If there is no second highest salary, then the query should return null.

    对于null的处理稍烦

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  • 原文地址:https://www.cnblogs.com/lailailai/p/4243043.html
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