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https://gitee.com/coder-xiaomo/leetcode-problemset
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96 lines
12 KiB
JSON
96 lines
12 KiB
JSON
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"questionId": "3767",
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"questionFrontendId": "3421",
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"categoryTitle": "Database",
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"boundTopicId": 3046795,
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"title": "Find Students Who Improved",
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"titleSlug": "find-students-who-improved",
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"content": "<p>Table: <code>Scores</code></p>\n\n<pre>\n+-------------+---------+\n| Column Name | Type |\n+-------------+---------+\n| student_id | int |\n| subject | varchar |\n| score | int |\n| exam_date | varchar |\n+-------------+---------+\n(student_id, subject, exam_date) is the primary key for this table.\nEach row contains information about a student's score in a specific subject on a particular exam date. score is between 0 and 100 (inclusive).\n</pre>\n\n<p>Write a solution to find the <strong>students who have shown improvement</strong>. A student is considered to have shown improvement if they meet <strong>both</strong> of these conditions:</p>\n\n<ul>\n\t<li>Have taken exams in the <strong>same subject</strong> on at least two different dates</li>\n\t<li>Their <strong>latest score</strong> in that subject is <strong>higher</strong> than their <strong>first score</strong></li>\n</ul>\n\n<p>Return <em>the result table</em> <em>ordered by</em> <code>student_id,</code> <code>subject</code> <em>in <strong>ascending</strong> order</em>.</p>\n\n<p>The result format is in the following example.</p>\n\n<p> </p>\n<p><strong class=\"example\">Example:</strong></p>\n\n<div class=\"example-block\">\n<p><strong>Input:</strong></p>\n\n<p>Scores table:</p>\n\n<pre class=\"example-io\">\n+------------+----------+-------+------------+\n| student_id | subject | score | exam_date |\n+------------+----------+-------+------------+\n| 101 | Math | 70 | 2023-01-15 |\n| 101 | Math | 85 | 2023-02-15 |\n| 101 | Physics | 65 | 2023-01-15 |\n| 101 | Physics | 60 | 2023-02-15 |\n| 102 | Math | 80 | 2023-01-15 |\n| 102 | Math | 85 | 2023-02-15 |\n| 103 | Math | 90 | 2023-01-15 |\n| 104 | Physics | 75 | 2023-01-15 |\n| 104 | Physics | 85 | 2023-02-15 |\n+------------+----------+-------+------------+\n</pre>\n\n<p><strong>Output:</strong></p>\n\n<pre class=\"example-io\">\n+------------+----------+-------------+--------------+\n| student_id | subject | first_score | latest_score |\n+------------+----------+-------------+--------------+\n| 101 | Math | 70 | 85 |\n| 102 | Math | 80 | 85 |\n| 104 | Physics | 75 | 85 |\n+------------+----------+-------------+--------------+\n</pre>\n\n<p><strong>Explanation:</strong></p>\n\n<ul>\n\t<li>Student 101 in Math: Improved from 70 to 85</li>\n\t<li>Student 101 in Physics: No improvement (dropped from 65 to 60)</li>\n\t<li>Student 102 in Math: Improved from 80 to 85</li>\n\t<li>Student 103 in Math: Only one exam, not eligible</li>\n\t<li>Student 104 in Physics: Improved from 75 to 85</li>\n</ul>\n\n<p>Result table is ordered by student_id, subject.</p>\n</div>\n",
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"translatedTitle": "查找进步的学生",
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"translatedContent": "<p>表：<code>Scores</code></p>\n\n<pre>\n+-------------+---------+\n| Column Name | Type |\n+-------------+---------+\n| student_id | int |\n| subject | varchar |\n| score | int |\n| exam_date | varchar |\n+-------------+---------+\n(student_id, subject, exam_date) 是这张表的主键。\n每一行包含有关学生在特定考试日期特定科目成绩的信息。分数范围从 0 到 100（包括边界）。\n</pre>\n\n<p>编写一个解决方案来查找 <strong>进步的学生</strong>。如果 <strong>同时</strong> 满足以下两个条件，则该学生被认为是进步的：</p>\n\n<ul>\n\t<li>在 <strong>同一科目</strong> 至少参加过两个不同日期的考试。</li>\n\t<li>他们在该学科<strong> 最近的分数 </strong>比他们 第一次该学科考试的分数更高。</li>\n</ul>\n\n<p>返回结果表以 <code>student_id</code>，<code>subject</code> <strong>升序</strong> 排序。</p>\n\n<p>结果格式如下所示。</p>\n\n<p> </p>\n\n<p><strong class=\"example\">示例：</strong></p>\n\n<div class=\"example-block\">\n<p><strong>输入：</strong></p>\n\n<p>Scores 表：</p>\n\n<pre>\n+------------+----------+-------+------------+\n| student_id | subject | score | exam_date |\n+------------+----------+-------+------------+\n| 101 | Math | 70 | 2023-01-15 |\n| 101 | Math | 85 | 2023-02-15 |\n| 101 | Physics | 65 | 2023-01-15 |\n| 101 | Physics | 60 | 2023-02-15 |\n| 102 | Math | 80 | 2023-01-15 |\n| 102 | Math | 85 | 2023-02-15 |\n| 103 | Math | 90 | 2023-01-15 |\n| 104 | Physics | 75 | 2023-01-15 |\n| 104 | Physics | 85 | 2023-02-15 |\n+------------+----------+-------+------------+</pre>\n\n<p><strong>出：</strong></p>\n\n<pre class=\"example-io\">\n+------------+----------+-------------+--------------+\n| student_id | subject | first_score | latest_score |\n+------------+----------+-------------+--------------+\n| 101 | Math | 70 | 85 |\n| 102 | Math | 80 | 85 |\n| 104 | Physics | 75 | 85 |\n+------------+----------+-------------+--------------+\n</pre>\n\n<p><strong>解释：</strong></p>\n\n<ul>\n\t<li>学生 101 的数学：从 70 分进步到 85 分。</li>\n\t<li>学生 101 的物理：没有进步（从 65 分退步到 60分）</li>\n\t<li>学生 102 的数学：从 80 进步到 85 分。</li>\n\t<li>学生 103 的数学：只有一次考试，不符合资格。</li>\n\t<li>学生 104 的物理：从 75 分进步到 85 分。</li>\n</ul>\n\n<p>结果表以 student_id，subject 升序排序。</p>\n</div>\n",
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"sampleTestCase": "{\"headers\":{\"Scores\":[\"student_id\",\"subject\",\"score\",\"exam_date\"]},\"rows\":{\"Scores\":[[101,\"Math\",70,\"2023-01-15\"],[101,\"Math\",85,\"2023-02-15\"],[101,\"Physics\",65,\"2023-01-15\"],[101,\"Physics\",60,\"2023-02-15\"],[102,\"Math\",80,\"2023-01-15\"],[102,\"Math\",85,\"2023-02-15\"],[103,\"Math\",90,\"2023-01-15\"],[104,\"Physics\",75,\"2023-01-15\"],[104,\"Physics\",85,\"2023-02-15\"]]}}",
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"CREATE TABLE Scores (\n student_id INT,\n subject VARCHAR(50),\n score INT,\n exam_date VARCHAR(10)\n)",
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"insert into Scores (student_id, subject, score, exam_date) values ('101', 'Math', '70', '2023-01-15')",
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"insert into Scores (student_id, subject, score, exam_date) values ('101', 'Math', '85', '2023-02-15')",
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"insert into Scores (student_id, subject, score, exam_date) values ('101', 'Physics', '65', '2023-01-15')",
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"insert into Scores (student_id, subject, score, exam_date) values ('101', 'Physics', '60', '2023-02-15')",
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"insert into Scores (student_id, subject, score, exam_date) values ('102', 'Math', '80', '2023-01-15')",
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"insert into Scores (student_id, subject, score, exam_date) values ('102', 'Math', '85', '2023-02-15')",
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"insert into Scores (student_id, subject, score, exam_date) values ('103', 'Math', '90', '2023-01-15')",
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"insert into Scores (student_id, subject, score, exam_date) values ('104', 'Physics', '75', '2023-01-15')",
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"insert into Scores (student_id, subject, score, exam_date) values ('104', 'Physics', '85', '2023-02-15')"
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