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<p>Table: <code>Employee</code></p>
<pre>
+-------------+------+
| 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.
</pre>
<p>&nbsp;</p>
<p>Write an SQL query to report the second highest salary from the <code>Employee</code> table. If there is no second highest salary, the query should report <code>null</code>.</p>
<p>The query result format is in the following example.</p>
<p>&nbsp;</p>
<p><strong>Example 1:</strong></p>
<pre>
<strong>Input:</strong>
Employee table:
+----+--------+
| id | salary |
+----+--------+
| 1 | 100 |
| 2 | 200 |
| 3 | 300 |
+----+--------+
<strong>Output:</strong>
+---------------------+
| SecondHighestSalary |
+---------------------+
| 200 |
+---------------------+
</pre>
<p><strong>Example 2:</strong></p>
<pre>
<strong>Input:</strong>
Employee table:
+----+--------+
| id | salary |
+----+--------+
| 1 | 100 |
+----+--------+
<strong>Output:</strong>
+---------------------+
| SecondHighestSalary |
+---------------------+
| null |
+---------------------+
</pre>