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62 lines
1.2 KiB
HTML
62 lines
1.2 KiB
HTML
<code>Employee</code> 表：
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<div class="original__bRMd">
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<div>
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<pre>
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+-------------+------+
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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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在 SQL 中，id 是这个表的主键。
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表的每一行包含员工的工资信息。
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</pre>
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<p> </p>
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<p>查询并返回 <code>Employee</code> 表中第二高的薪水 。如果不存在第二高的薪水，查询应该返回 <code>null(Pandas 则返回 None)</code> 。</p>
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<p>查询结果如下例所示。</p>
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<p> </p>
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<p><strong>示例 1：</strong></p>
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<pre>
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<strong>输入：</strong>
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Employee 表：
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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>输出：</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>示例 2：</strong></p>
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<pre>
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<strong>输入：</strong>
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Employee 表：
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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>输出：</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>
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</div>
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