mirror of
https://gitee.com/coder-xiaomo/leetcode-problemset
synced 2025-01-10 18:48:13 +08:00
50 lines
1.7 KiB
HTML
50 lines
1.7 KiB
HTML
<p>表 <code>Department</code>：</p>
|
||
|
||
<pre>
|
||
+---------------+---------+
|
||
| Column Name | Type |
|
||
+---------------+---------+
|
||
| id | int |
|
||
| revenue | int |
|
||
| month | varchar |
|
||
+---------------+---------+
|
||
在 SQL 中，(id, month) 是表的联合主键。
|
||
这个表格有关于每个部门每月收入的信息。
|
||
月份（month）可以取下列值 ["Jan","Feb","Mar","Apr","May","Jun","Jul","Aug","Sep","Oct","Nov","Dec"]。
|
||
</pre>
|
||
|
||
<p> </p>
|
||
|
||
<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>
|
||
|
||
<p>以 <strong>任意顺序</strong> 返回结果表。</p>
|
||
|
||
<p>结果格式如以下示例所示。</p>
|
||
|
||
<p> </p>
|
||
|
||
<p><strong>示例 1：</strong></p>
|
||
|
||
<pre>
|
||
<b>输入：</b>
|
||
Department table:
|
||
+------+---------+-------+
|
||
| id | revenue | month |
|
||
+------+---------+-------+
|
||
| 1 | 8000 | Jan |
|
||
| 2 | 9000 | Jan |
|
||
| 3 | 10000 | Feb |
|
||
| 1 | 7000 | Feb |
|
||
| 1 | 6000 | Mar |
|
||
+------+---------+-------+
|
||
<b>输出：</b>
|
||
+------+-------------+-------------+-------------+-----+-------------+
|
||
| id | Jan_Revenue | Feb_Revenue | Mar_Revenue | ... | Dec_Revenue |
|
||
+------+-------------+-------------+-------------+-----+-------------+
|
||
| 1 | 8000 | 7000 | 6000 | ... | null |
|
||
| 2 | 9000 | null | null | ... | null |
|
||
| 3 | null | 10000 | null | ... | null |
|
||
+------+-------------+-------------+-------------+-----+-------------+
|
||
<b>解释：</b>四月到十二月的收入为空。
|
||
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>
|