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add leetcode problem-cn part1
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算法题(国内版)/problem (Chinese)/股票的资本损益 [capital-gainloss].html
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算法题(国内版)/problem (Chinese)/股票的资本损益 [capital-gainloss].html
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<p><code>Stocks</code> 表:</p>
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<pre>+---------------+---------+
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| Column Name | Type |
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+---------------+---------+
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| stock_name | varchar |
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| operation | enum |
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| operation_day | int |
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| price | int |
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+---------------+---------+
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(stock_name, day) 是这张表的主键
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operation 列使用的是一种枚举类型,包括:('Sell','Buy')
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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。
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保证股票的每次'Sell'操作前,都有相应的'Buy'操作。
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</pre>
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<p> </p>
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<p>编写一个SQL查询来报告每支股票的资本损益。</p>
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<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>
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<p>以任意顺序返回结果即可。</p>
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<p>SQL查询结果的格式如下例所示:</p>
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<pre><code>Stocks</code> 表:
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+---------------+-----------+---------------+--------+
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| stock_name | operation | operation_day | price |
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+---------------+-----------+---------------+--------+
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| Leetcode | Buy | 1 | 1000 |
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| Corona Masks | Buy | 2 | 10 |
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| Leetcode | Sell | 5 | 9000 |
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| Handbags | Buy | 17 | 30000 |
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| Corona Masks | Sell | 3 | 1010 |
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| Corona Masks | Buy | 4 | 1000 |
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| Corona Masks | Sell | 5 | 500 |
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| Corona Masks | Buy | 6 | 1000 |
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| Handbags | Sell | 29 | 7000 |
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| Corona Masks | Sell | 10 | 10000 |
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+---------------+-----------+---------------+--------+
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Result 表:
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+---------------+-------------------+
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| stock_name | capital_gain_loss |
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+---------------+-------------------+
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| Corona Masks | 9500 |
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| Leetcode | 8000 |
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| Handbags | -23000 |
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+---------------+-------------------+
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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。
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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。
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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。
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</pre>
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