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<p>Table: <code>Stocks</code></p>
<pre>
+---------------+---------+
| Column Name | Type |
+---------------+---------+
| stock_name | varchar |
| operation | enum |
| operation_day | int |
| price | int |
+---------------+---------+
(stock_name, operation_day) is the primary key for this table.
The operation column is an ENUM of type (&#39;Sell&#39;, &#39;Buy&#39;)
Each row of this table indicates that the stock which has stock_name had an operation on the day operation_day with the price.
It is guaranteed that each &#39;Sell&#39; operation for a stock has a corresponding &#39;Buy&#39; operation in a previous day. It is also guaranteed that each &#39;Buy&#39; operation for a stock has a corresponding &#39;Sell&#39; operation in an upcoming day.
</pre>
<p>&nbsp;</p>
<p>Write an SQL query to report the <strong>Capital gain/loss</strong> for each stock.</p>
<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>
<p>Return the result table in <strong>any order</strong>.</p>
<p>The query result format is in the following example.</p>
<p>&nbsp;</p>
<p><strong>Example 1:</strong></p>
<pre>
<strong>Input:</strong>
Stocks table:
+---------------+-----------+---------------+--------+
| 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 |
+---------------+-----------+---------------+--------+
<strong>Output:</strong>
+---------------+-------------------+
| stock_name | capital_gain_loss |
+---------------+-------------------+
| Corona Masks | 9500 |
| Leetcode | 8000 |
| Handbags | -23000 |
+---------------+-------------------+
<strong>Explanation:</strong>
Leetcode stock was bought at day 1 for 1000$ and was sold at day 5 for 9000$. Capital gain = 9000 - 1000 = 8000$.
Handbags stock was bought at day 17 for 30000$ and was sold at day 29 for 7000$. Capital loss = 7000 - 30000 = -23000$.
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$. Capital gain/loss is the sum of capital gains/losses for each (&#39;Buy&#39; --&gt; &#39;Sell&#39;) operation = (1010 - 10) + (500 - 1000) + (10000 - 1000) = 1000 - 500 + 9000 = 9500$.
</pre>