[SQL] [LeetCode] Challenge log 177

Posted on | Edited on |
177. Nth Highest Salary

Use limit, offset, order by together

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

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+----+--------+
| 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.

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+------------------------+
| getNthHighestSalary(2) |
+------------------------+
| 200                    |
+------------------------+
Soulution:
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CREATE FUNCTION getNthHighestSalary(N INT) RETURNS INT
BEGIN
    set N = N-1;
  RETURN (
      # Write your MySQL query statement below.

      select distinct salary
      from Employee
      order by salary desc
      limit 1 offset N
          
    
  );
END
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-- alter
CREATE FUNCTION getNthHighestSalary(N INT) RETURNS INT
BEGIN
    set N=N-1;
  RETURN (
      # Write your MySQL query statement below.
      select max(E.salary)
      from Employee E
      where E.salary not in (
      select t.salary 
      from 
      (
          select distinct A.salary
          from Employee A
          order by A.salary desc 
          limit N
      ) as t
          
    )
  );
END
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