标签:Salary INT Nth Employee Highest E1 SELECT E2
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
标签:Salary,INT,Nth,Employee,Highest,E1,SELECT,E2 来源: https://www.cnblogs.com/lsyb-python/p/11011216.html
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