# ---
# title: 176. Second Highest Salary
# id: problem176
# author: Tian Jun
# date: 2020-10-31
# difficulty: Easy
# categories: 
# link: <https://leetcode.com/problems/second-highest-salary/description/>
# hidden: true
# ---
# 
# 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 query should return `200` as
# the second highest salary. If there is no second highest salary, then the
# query should return `null`.
# 
#     
#     
#     +---------------------+
#     | SecondHighestSalary |
#     +---------------------+
#     | 200                 |
#     +---------------------+
#     
# 
# 
## @lc code=start
using LeetCode

## add your code here:
## @lc code=end
