nth-highest-salary

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Database

Table: <code>Employee</code>

<pre>
+-------------+------+
| Column Name | Type |
+-------------+------+
| id | int |
| salary | int |
+-------------+------+
id is the primary key (column with unique values) for this table.
Each row of this table contains information about the salary of an employee.
</pre>

&nbsp;

Write a solution to find the <code>nth</code> highest distinct salary from the <code>Employee</code> table. If there are less than <code>n</code> distinct salaries, return&nbsp;<code>null</code>.

The result format is in the following example.

&nbsp;
Example 1:

<pre>
Input: 
Employee table:
+----+--------+
| id | salary |
+----+--------+
| 1 | 100 |
| 2 | 200 |
| 3 | 300 |
+----+--------+
n = 2
Output: 
+------------------------+
| getNthHighestSalary(2) |
+------------------------+
| 200 |
+------------------------+
</pre>

Example 2:

<pre>
Input: 
Employee table:
+----+--------+
| id | salary |
+----+--------+
| 1 | 100 |
+----+--------+
n = 2
Output: 
+------------------------+
| getNthHighestSalary(2) |
+------------------------+
| null |
+------------------------+
</pre>

nth_highest_salary

Nth Highest Salary

The Number of Users That Are Eligible for Discount

the-number-of-users-that-are-eligible-for-discount

有资格享受折扣的用户数量

表:&nbsp;<code>Employee</code>

<pre>
+-------------+------+
| Column Name | Type |
+-------------+------+
| id | int |
| salary | int |
+-------------+------+
id 是该表的主键（列中的值互不相同）。
该表的每一行都包含有关员工工资的信息。
</pre>

&nbsp;

编写一个解决方案查询&nbsp;<code>Employee</code> 表中第 <code>n</code> 高的&nbsp;不同 工资。如果少于&nbsp;<code>n</code> 个不同工资，查询结果应该为&nbsp;<code>null</code> 。

查询结果格式如下所示。

&nbsp;

示例 1:

<pre>
输入: 
Employee table:
+----+--------+
| id | salary |
+----+--------+
| 1 | 100 |
| 2 | 200 |
| 3 | 300 |
+----+--------+
n = 2
输出: 
+------------------------+
| getNthHighestSalary(2) |
+------------------------+
| 200 |
+------------------------+
</pre>

示例 2:

<pre>
输入: 
Employee 表:
+----+--------+
| id | salary |
+----+--------+
| 1 | 100 |
+----+--------+
n = 2
输出: 
+------------------------+
| getNthHighestSalary(2) |
+------------------------+
| null |
+------------------------+</pre>