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+<pre>
+DataFrame <code>employees</code>
+-------------+--------+
+| Column Name | Type   |
+-------------+--------+
+| name        | object |
+| salary      | int    |
+-------------+--------+
+</pre>
+
+<p>一家公司决定增加员工的薪水。</p>
+
+<p>编写一个解决方案，将每个员工的薪水乘以2来 <strong>修改</strong>&nbsp;<code>salary</code>&nbsp;列。</p>
+
+<p>返回结果格式如下示例所示。</p>
+
+<p>&nbsp;</p>
+
+<p><b>示例 1:</b></p>
+
+<pre>
+<strong>输入：
+</strong>DataFrame employees
+---------+--------+
+| name    | salary |
+---------+--------+
+| Jack    | 19666  |
+| Piper   | 74754  |
+| Mia     | 62509  |
+| Ulysses | 54866  |
+---------+--------+
+<strong>输出：
+</strong>+---------+--------+
+| name    | salary |
+---------+--------+
+| Jack    | 39332  |
+| Piper   | 149508 |
+| Mia     | 125018 |
+| Ulysses | 109732 |
+---------+--------+
+<strong>解释：
+</strong>每个人的薪水都被加倍。</pre>