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