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        "question": {
            "questionId": "1523",
            "questionFrontendId": "1393",
            "boundTopicId": null,
            "title": "Capital Gain/Loss",
            "titleSlug": "capital-gainloss",
            "content": "<p>Table: <code>Stocks</code></p>\n\n<pre>\n+---------------+---------+\n| Column Name   | Type    |\n+---------------+---------+\n| stock_name    | varchar |\n| operation     | enum    |\n| operation_day | int     |\n| price         | int     |\n+---------------+---------+\n(stock_name, operation_day) is the primary key for this table.\nThe operation column is an ENUM of type (&#39;Sell&#39;, &#39;Buy&#39;)\nEach row of this table indicates that the stock which has stock_name had an operation on the day operation_day with the price.\nIt 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.\n</pre>\n\n<p>&nbsp;</p>\n\n<p>Write an SQL query to report the <strong>Capital gain/loss</strong> for each stock.</p>\n\n<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>\n\n<p>Return the result table in <strong>any order</strong>.</p>\n\n<p>The query result format is in the following example.</p>\n\n<p>&nbsp;</p>\n<p><strong>Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> \nStocks table:\n+---------------+-----------+---------------+--------+\n| stock_name    | operation | operation_day | price  |\n+---------------+-----------+---------------+--------+\n| Leetcode      | Buy       | 1             | 1000   |\n| Corona Masks  | Buy       | 2             | 10     |\n| Leetcode      | Sell      | 5             | 9000   |\n| Handbags      | Buy       | 17            | 30000  |\n| Corona Masks  | Sell      | 3             | 1010   |\n| Corona Masks  | Buy       | 4             | 1000   |\n| Corona Masks  | Sell      | 5             | 500    |\n| Corona Masks  | Buy       | 6             | 1000   |\n| Handbags      | Sell      | 29            | 7000   |\n| Corona Masks  | Sell      | 10            | 10000  |\n+---------------+-----------+---------------+--------+\n<strong>Output:</strong> \n+---------------+-------------------+\n| stock_name    | capital_gain_loss |\n+---------------+-------------------+\n| Corona Masks  | 9500              |\n| Leetcode      | 8000              |\n| Handbags      | -23000            |\n+---------------+-------------------+\n<strong>Explanation:</strong> \nLeetcode stock was bought at day 1 for 1000$ and was sold at day 5 for 9000$. Capital gain = 9000 - 1000 = 8000$.\nHandbags stock was bought at day 17 for 30000$ and was sold at day 29 for 7000$. Capital loss = 7000 - 30000 = -23000$.\nCorona 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$. Capital gain/loss is the sum of capital gains/losses for each (&#39;Buy&#39; --&gt; &#39;Sell&#39;) operation = (1010 - 10) + (500 - 1000) + (10000 - 1000) = 1000 - 500 + 9000 = 9500$.\n</pre>\n",
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            "difficulty": "Medium",
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            "exampleTestcases": "{\"headers\":{\"Stocks\":[\"stock_name\",\"operation\",\"operation_day\",\"price\"]},\"rows\":{\"Stocks\":[[\"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]]}}",
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                    "lang": "MySQL",
                    "langSlug": "mysql",
                    "code": "# Write your MySQL query statement below\n",
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                    "lang": "MS SQL Server",
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                    "code": "/* Write your T-SQL query statement below */\n",
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            "sampleTestCase": "{\"headers\":{\"Stocks\":[\"stock_name\",\"operation\",\"operation_day\",\"price\"]},\"rows\":{\"Stocks\":[[\"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]]}}",
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            "mysqlSchemas": [
                "Create Table If Not Exists Stocks (stock_name varchar(15), operation ENUM('Sell', 'Buy'), operation_day int, price int)",
                "Truncate table Stocks",
                "insert into Stocks (stock_name, operation, operation_day, price) values ('Leetcode', 'Buy', '1', '1000')",
                "insert into Stocks (stock_name, operation, operation_day, price) values ('Corona Masks', 'Buy', '2', '10')",
                "insert into Stocks (stock_name, operation, operation_day, price) values ('Leetcode', 'Sell', '5', '9000')",
                "insert into Stocks (stock_name, operation, operation_day, price) values ('Handbags', 'Buy', '17', '30000')",
                "insert into Stocks (stock_name, operation, operation_day, price) values ('Corona Masks', 'Sell', '3', '1010')",
                "insert into Stocks (stock_name, operation, operation_day, price) values ('Corona Masks', 'Buy', '4', '1000')",
                "insert into Stocks (stock_name, operation, operation_day, price) values ('Corona Masks', 'Sell', '5', '500')",
                "insert into Stocks (stock_name, operation, operation_day, price) values ('Corona Masks', 'Buy', '6', '1000')",
                "insert into Stocks (stock_name, operation, operation_day, price) values ('Handbags', 'Sell', '29', '7000')",
                "insert into Stocks (stock_name, operation, operation_day, price) values ('Corona Masks', 'Sell', '10', '10000')"
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