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61 lines
3.0 KiB
HTML
61 lines
3.0 KiB
HTML
<p>Table: <code>Stocks</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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| 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, operation_day) is the primary key (combination of columns with unique values) for this table.
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The operation column is an ENUM (category) of type ('Sell', 'Buy')
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Each row of this table indicates that the stock which has stock_name had an operation on the day operation_day with the price.
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It is guaranteed that each 'Sell' operation for a stock has a corresponding 'Buy' operation in a previous day. It is also guaranteed that each 'Buy' operation for a stock has a corresponding 'Sell' operation in an upcoming day.
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</pre>
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<p> </p>
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<p>Write a solution to report the <strong>Capital gain/loss</strong> for each stock.</p>
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<p>The <strong>Capital gain/loss</strong> of a stock is the total gain or loss after buying and selling the stock one or many times.</p>
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<p>Return the result table in <strong>any order</strong>.</p>
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<p>The result format is in the following example.</p>
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<p> </p>
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<p><strong class="example">Example 1:</strong></p>
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<pre>
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<strong>Input:</strong>
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Stocks table:
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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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<strong>Output:</strong>
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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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<strong>Explanation:</strong>
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Leetcode stock was bought at day 1 for 1000$ and was sold at day 5 for 9000$. Capital gain = 9000 - 1000 = 8000$.
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Handbags stock was bought at day 17 for 30000$ and was sold at day 29 for 7000$. Capital loss = 7000 - 30000 = -23000$.
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Corona Masks stock was bought at day 1 for 10$ and was sold at day 3 for 1010$. It was bought again at day 4 for 1000$ and was sold at day 5 for 500$. At last, it was bought at day 6 for 1000$ and was sold at day 10 for 10000$. Capital gain/loss is the sum of capital gains/losses for each ('Buy' --> 'Sell') operation = (1010 - 10) + (500 - 1000) + (10000 - 1000) = 1000 - 500 + 9000 = 9500$.
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</pre>
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