mirror of
https://gitee.com/coder-xiaomo/leetcode-problemset
synced 2025-01-11 02:58:13 +08:00
55 lines
2.6 KiB
HTML
55 lines
2.6 KiB
HTML
|
<p><code>Stocks</code> 表：</p>
|
|||
|
|
|
|||
|
|
<pre>+---------------+---------+
|
|||
|
|
| Column Name | Type |
|
|||
|
|
+---------------+---------+
|
|||
|
|
| stock_name | varchar |
|
|||
|
|
| operation | enum |
|
|||
|
|
| operation_day | int |
|
|||
|
|
| price | int |
|
|||
|
|
+---------------+---------+
|
|||
|
|
(stock_name, day) 是这张表的主键
|
|||
|
|
operation 列使用的是一种枚举类型，包括：('Sell','Buy')
|
|||
|
|
此表的每一行代表了名为 stock_name 的某支股票在 operation_day 这一天的操作价格。
|
|||
|
|
保证股票的每次'Sell'操作前，都有相应的'Buy'操作。
|
|||
|
|
</pre>
|
|||
|
|
|
|||
|
|
<p> </p>
|
|||
|
|
|
|||
|
|
<p>编写一个SQL查询来报告每支股票的资本损益。</p>
|
|||
|
|
|
|||
|
|
<p>股票的资本损益是一次或多次买卖股票后的全部收益或损失。</p>
|
|||
|
|
|
|||
|
|
<p>以任意顺序返回结果即可。</p>
|
|||
|
|
|
|||
|
|
<p>SQL查询结果的格式如下例所示：</p>
|
|||
|
|
|
|||
|
|
<pre><code>Stocks</code> 表:
|
|||
|
|
+---------------+-----------+---------------+--------+
|
|||
|
|
| stock_name | operation | operation_day | price |
|
|||
|
|
+---------------+-----------+---------------+--------+
|
|||
|
|
| Leetcode | Buy | 1 | 1000 |
|
|||
|
|
| Corona Masks | Buy | 2 | 10 |
|
|||
|
|
| Leetcode | Sell | 5 | 9000 |
|
|||
|
|
| Handbags | Buy | 17 | 30000 |
|
|||
|
|
| Corona Masks | Sell | 3 | 1010 |
|
|||
|
|
| Corona Masks | Buy | 4 | 1000 |
|
|||
|
|
| Corona Masks | Sell | 5 | 500 |
|
|||
|
|
| Corona Masks | Buy | 6 | 1000 |
|
|||
|
|
| Handbags | Sell | 29 | 7000 |
|
|||
|
|
| Corona Masks | Sell | 10 | 10000 |
|
|||
|
|
+---------------+-----------+---------------+--------+
|
|||
|
|
|
|||
|
|
Result 表:
|
|||
|
|
+---------------+-------------------+
|
|||
|
|
| stock_name | capital_gain_loss |
|
|||
|
|
+---------------+-------------------+
|
|||
|
|
| Corona Masks | 9500 |
|
|||
|
|
| Leetcode | 8000 |
|
|||
|
|
| Handbags | -23000 |
|
|||
|
|
+---------------+-------------------+
|
|||
|
|
Leetcode 股票在第一天以1000美元的价格买入，在第五天以9000美元的价格卖出。资本收益=9000-1000=8000美元。
|
|||
|
|
Handbags 股票在第17天以30000美元的价格买入，在第29天以7000美元的价格卖出。资本损失=7000-30000=-23000美元。
|
|||
|
|
Corona Masks 股票在第1天以10美元的价格买入，在第3天以1010美元的价格卖出。在第4天以1000美元的价格再次购买，在第5天以500美元的价格出售。最后，它在第6天以1000美元的价格被买走，在第10天以10000美元的价格被卖掉。资本损益是每次（’Buy'->'Sell'）操作资本收益或损失的和=（1010-10）+（500-1000）+（10000-1000）=1000-500+9000=9500美元。
|
|||
|
|
</pre>
|