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https://gitee.com/coder-xiaomo/leetcode-problemset
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85 lines
12 KiB
JSON
85 lines
12 KiB
JSON
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"questionId": "1523",
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"questionFrontendId": "1393",
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"categoryTitle": "Database",
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"boundTopicId": 172858,
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"title": "Capital Gain/Loss",
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"titleSlug": "capital-gainloss",
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"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 ('Sell', 'Buy')\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 '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.\n</pre>\n\n<p> </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> </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$. Capital gain/loss is the sum of capital gains/losses for each ('Buy' --> 'Sell') operation = (1010 - 10) + (500 - 1000) + (10000 - 1000) = 1000 - 500 + 9000 = 9500$.\n</pre>\n",
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"translatedTitle": "股票的资本损益",
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"translatedContent": "<p><code>Stocks</code> 表：</p>\n\n<pre>+---------------+---------+\n| Column Name | Type |\n+---------------+---------+\n| stock_name | varchar |\n| operation | enum |\n| operation_day | int |\n| price | int |\n+---------------+---------+\n(stock_name, day) 是这张表的主键\noperation 列使用的是一种枚举类型，包括：('Sell','Buy')\n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。\n保证股票的每次'Sell'操作前，都有相应的'Buy'操作。\n</pre>\n\n<p> </p>\n\n<p>编写一个SQL查询来报告每支股票的资本损益。</p>\n\n<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>\n\n<p>以任意顺序返回结果即可。</p>\n\n<p>SQL查询结果的格式如下例所示：</p>\n\n<pre><code>Stocks</code> 表:\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\nResult 表:\n+---------------+-------------------+\n| stock_name | capital_gain_loss |\n+---------------+-------------------+\n| Corona Masks | 9500 |\n| Leetcode | 8000 |\n| Handbags | -23000 |\n+---------------+-------------------+\nLeetcode 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。\nHandbags 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。\nCorona 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。\n</pre>\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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"Create Table If Not Exists Stocks (stock_name varchar(15), operation ENUM('Sell', 'Buy'), operation_day int, price int)",
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"Truncate table Stocks",
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"insert into Stocks (stock_name, operation, operation_day, price) values ('Leetcode', 'Buy', '1', '1000')",
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"insert into Stocks (stock_name, operation, operation_day, price) values ('Corona Masks', 'Buy', '2', '10')",
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"insert into Stocks (stock_name, operation, operation_day, price) values ('Leetcode', 'Sell', '5', '9000')",
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"insert into Stocks (stock_name, operation, operation_day, price) values ('Handbags', 'Buy', '17', '30000')",
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"insert into Stocks (stock_name, operation, operation_day, price) values ('Corona Masks', 'Sell', '3', '1010')",
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"insert into Stocks (stock_name, operation, operation_day, price) values ('Corona Masks', 'Buy', '4', '1000')",
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"insert into Stocks (stock_name, operation, operation_day, price) values ('Corona Masks', 'Sell', '5', '500')",
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"insert into Stocks (stock_name, operation, operation_day, price) values ('Corona Masks', 'Buy', '6', '1000')",
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"insert into Stocks (stock_name, operation, operation_day, price) values ('Handbags', 'Sell', '29', '7000')",
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"insert into Stocks (stock_name, operation, operation_day, price) values ('Corona Masks', 'Sell', '10', '10000')"
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