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50 lines
1.7 KiB
HTML
50 lines
1.7 KiB
HTML
<p>表 <code>Department</code>：</p>
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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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| revenue | int |
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| month | varchar |
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+---------------+---------+
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在 SQL 中，(id, month) 是表的联合主键。
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这个表格有关于每个部门每月收入的信息。
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月份（month）可以取下列值 ["Jan","Feb","Mar","Apr","May","Jun","Jul","Aug","Sep","Oct","Nov","Dec"]。
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</pre>
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<p> </p>
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<p>重新格式化表格，使得 <strong>每个月 </strong>都有一个部门 id 列和一个收入列。</p>
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<p>以 <strong>任意顺序</strong> 返回结果表。</p>
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<p>结果格式如以下示例所示。</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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<b>输入：</b>
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Department table:
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+------+---------+-------+
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| id | revenue | month |
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+------+---------+-------+
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| 1 | 8000 | Jan |
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| 2 | 9000 | Jan |
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| 3 | 10000 | Feb |
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| 1 | 7000 | Feb |
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| 1 | 6000 | Mar |
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+------+---------+-------+
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<b>输出：</b>
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+------+-------------+-------------+-------------+-----+-------------+
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| id | Jan_Revenue | Feb_Revenue | Mar_Revenue | ... | Dec_Revenue |
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+------+-------------+-------------+-------------+-----+-------------+
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| 1 | 8000 | 7000 | 6000 | ... | null |
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| 2 | 9000 | null | null | ... | null |
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| 3 | null | 10000 | null | ... | null |
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+------+-------------+-------------+-------------+-----+-------------+
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<b>解释：</b>四月到十二月的收入为空。
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请注意，结果表共有 13 列（1 列用于部门 ID，其余 12 列用于各个月份）。</pre>
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