Second Highest Salary/查找萬年老二

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                 |
+---------------------+

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選取工資排行第二的

select 
(select DISTINCT Salary 
from Employee 
order by Salary   desc
limit 1,1 ) 
as SecondHighestSalary
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