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55 lines
1.6 KiB
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<h2><a href="https://leetcode.com/problems/second-highest-salary/">176. Second Highest Salary</a></h2><h3>Medium</h3><hr><div class="sql-schema-wrapper__3VBi"><a class="sql-schema-link__3cEg">SQL Schema<svg viewBox="0 0 24 24" width="1em" height="1em" class="icon__1Md2"><path fill-rule="evenodd" d="M10 6L8.59 7.41 13.17 12l-4.58 4.59L10 18l6-6z"></path></svg></a></div><div><p>Table: <code>Employee</code></p>
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<pre>+-------------+------+
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| Column Name | Type |
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+-------------+------+
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| id | int |
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| salary | int |
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+-------------+------+
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id is the primary key column for this table.
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Each row of this table contains information about the salary of an employee.
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</pre>
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<p> </p>
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<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>
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<p>The query result format is in the following example.</p>
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<p> </p>
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<p><strong class="example">Example 1:</strong></p>
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<pre><strong>Input:</strong>
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Employee table:
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+----+--------+
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| id | salary |
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+----+--------+
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| 1 | 100 |
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| 2 | 200 |
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| 3 | 300 |
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+----+--------+
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<strong>Output:</strong>
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+---------------------+
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| SecondHighestSalary |
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+---------------------+
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| 200 |
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+---------------------+
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</pre>
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<p><strong class="example">Example 2:</strong></p>
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<pre><strong>Input:</strong>
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Employee table:
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+----+--------+
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| id | salary |
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+----+--------+
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| 1 | 100 |
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+----+--------+
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<strong>Output:</strong>
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+---------------------+
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| SecondHighestSalary |
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+---------------------+
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| null |
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+---------------------+
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</pre>
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</div> |