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177\. Nth Highest Salary

Medium

SQL Schema

Table: `Employee`

    +-------------+------+
    | Column Name | Type |
    +-------------+------+
    | id          | int  |
    | salary      | int  |
    +-------------+------+
    id is the primary key column for this table. Each row of this table contains information about the salary of an employee. 

Write an SQL query to report the `nth` highest salary from the `Employee` table. If there is no `nth` highest salary, the query should report `null`.

The query result format is in the following example.

**Example 1:**

**Input:**

    Employee table:
    +----+--------+
    | id | salary |
    +----+--------+
    | 1  | 100    |
    | 2  | 200    |
    | 3  | 300    |
    +----+--------+
    n = 2

**Output:**

    +------------------------+
    | getNthHighestSalary(2) |
    +------------------------+
    | 200                    |
    +------------------------+ 

**Example 2:**

**Input:**

    Employee table:
    +----+--------+
    | id | salary |
    +----+--------+
    | 1  | 100    |
    +----+--------+
    n = 2

**Output:**

    +------------------------+
    | getNthHighestSalary(2) |
    +------------------------+
    | null                   |
    +------------------------+ 




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