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75 lines
2.6 KiB
HTML
75 lines
2.6 KiB
HTML
<p>表：<code>Scores</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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| student_id | int |
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| subject | varchar |
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| score | int |
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| exam_date | varchar |
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+-------------+---------+
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(student_id, subject, exam_date) 是这张表的主键。
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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）。
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</pre>
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<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>
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<ul>
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<li>在 <strong>同一科目</strong> 至少参加过两个不同日期的考试。</li>
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<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>
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</ul>
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<p>返回结果表以 <code>student_id</code>，<code>subject</code> <strong>升序</strong> 排序。</p>
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<p>结果格式如下所示。</p>
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<p> </p>
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<p><strong class="example">示例：</strong></p>
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<div class="example-block">
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<p><strong>输入：</strong></p>
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<p>Scores 表：</p>
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<pre>
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+------------+----------+-------+------------+
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| student_id | subject | score | exam_date |
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+------------+----------+-------+------------+
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| 101 | Math | 70 | 2023-01-15 |
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| 101 | Math | 85 | 2023-02-15 |
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| 101 | Physics | 65 | 2023-01-15 |
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| 101 | Physics | 60 | 2023-02-15 |
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| 102 | Math | 80 | 2023-01-15 |
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| 102 | Math | 85 | 2023-02-15 |
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| 103 | Math | 90 | 2023-01-15 |
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| 104 | Physics | 75 | 2023-01-15 |
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| 104 | Physics | 85 | 2023-02-15 |
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+------------+----------+-------+------------+</pre>
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<p><strong>出：</strong></p>
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<pre class="example-io">
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+------------+----------+-------------+--------------+
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| student_id | subject | first_score | latest_score |
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+------------+----------+-------------+--------------+
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| 101 | Math | 70 | 85 |
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| 102 | Math | 80 | 85 |
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| 104 | Physics | 75 | 85 |
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+------------+----------+-------------+--------------+
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</pre>
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<p><strong>解释：</strong></p>
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<ul>
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<li>学生 101 的数学：从 70 分进步到 85 分。</li>
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<li>学生 101 的物理：没有进步（从 65 分退步到 60分）</li>
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<li>学生 102 的数学：从 80 进步到 85 分。</li>
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<li>学生 103 的数学：只有一次考试，不符合资格。</li>
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<li>学生 104 的物理：从 75 分进步到 85 分。</li>
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</ul>
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<p>结果表以 student_id，subject 升序排序。</p>
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</div>
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