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139 lines
4.7 KiB
HTML
139 lines
4.7 KiB
HTML
<p>表：<code>employees</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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| employee_id | int |
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| name | varchar |
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+-------------+---------+
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employee_id 是这张表的唯一主键。
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每一行包含一名员工的信息。
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</pre>
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<p>表：<code>performance_reviews</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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| review_id | int |
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| employee_id | int |
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| review_date | date |
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| rating | int |
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+-------------+------+
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review_id 是这张表的唯一主键。
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每一行表示一名员工的绩效评估。评分在 1-5 的范围内，5分代表优秀，1分代表较差。
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</pre>
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<p>编写一个解决方案，以找到在过去三次评估中持续提高绩效的员工。</p>
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<ul>
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<li>员工 <strong>至少需要</strong> <code>3</code> <strong>次评估 </strong>才能被考虑</li>
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<li>员工过去的 <code>3</code> 次评估，评分必须 <strong>严格递增</strong>（每次评价都比上一次好）</li>
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<li>根据 <code>review_date</code> 为每位员工分析最近的 <code>3</code> 次评估</li>
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<li><strong>进步分数</strong> 为最后 <code>3</code> 次评估中最后一次评分与最早一次评分之间的差值</li>
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</ul>
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<p>返回结果表以<em> </em><strong>进步分数 降序</strong> 排序，然后以 <strong>名字</strong> <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>employees 表：</p>
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<pre class="example-io">
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+-------------+----------------+
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| employee_id | name |
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+-------------+----------------+
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| 1 | Alice Johnson |
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| 2 | Bob Smith |
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| 3 | Carol Davis |
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| 4 | David Wilson |
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| 5 | Emma Brown |
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+-------------+----------------+
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</pre>
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<p>performance_reviews 表：</p>
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<pre class="example-io">
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+-----------+-------------+-------------+--------+
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| review_id | employee_id | review_date | rating |
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+-----------+-------------+-------------+--------+
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| 1 | 1 | 2023-01-15 | 2 |
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| 2 | 1 | 2023-04-15 | 3 |
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| 3 | 1 | 2023-07-15 | 4 |
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| 4 | 1 | 2023-10-15 | 5 |
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| 5 | 2 | 2023-02-01 | 3 |
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| 6 | 2 | 2023-05-01 | 2 |
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| 7 | 2 | 2023-08-01 | 4 |
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| 8 | 2 | 2023-11-01 | 5 |
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| 9 | 3 | 2023-03-10 | 1 |
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| 10 | 3 | 2023-06-10 | 2 |
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| 11 | 3 | 2023-09-10 | 3 |
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| 12 | 3 | 2023-12-10 | 4 |
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| 13 | 4 | 2023-01-20 | 4 |
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| 14 | 4 | 2023-04-20 | 4 |
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| 15 | 4 | 2023-07-20 | 4 |
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| 16 | 5 | 2023-02-15 | 3 |
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| 17 | 5 | 2023-05-15 | 2 |
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+-----------+-------------+-------------+--------+
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</pre>
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<p><strong>输出：</strong></p>
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<pre class="example-io">
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+-------------+----------------+-------------------+
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| employee_id | name | improvement_score |
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+-------------+----------------+-------------------+
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| 2 | Bob Smith | 3 |
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| 1 | Alice Johnson | 2 |
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| 3 | Carol Davis | 2 |
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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><strong>Alice Johnson (employee_id = 1)：</strong>
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<ul>
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<li>有 4 次评估，分数：2, 3, 4, 5</li>
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<li>最后 3 次评估（按日期）：2023-04-15 (3), 2023-07-15 (4), 2023-10-15 (5)</li>
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<li>评分严格递增：3 → 4 → 5</li>
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<li>进步分数：5 - 3 = 2</li>
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</ul>
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</li>
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<li><strong>Carol Davis (employee_id = 3)：</strong>
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<ul>
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<li>有 4 次评估，分数：1, 2, 3, 4</li>
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<li>最后 3 次评估（按日期）：2023-06-10 (2)，2023-09-10 (3)，2023-12-10 (4)</li>
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<li>评分严格递增：2 → 3 → 4</li>
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<li>进步分数：4 - 2 = 2</li>
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</ul>
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</li>
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<li><strong>Bob Smith (employee_id = 2)：</strong>
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<ul>
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<li>有 4 次评估，分数：3，2，4，5</li>
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<li>最后 3 次评估（按日期）：2023-05-01 (2)，2023-08-01 (4)，2023-11-01 (5)</li>
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<li>评分严格递增：2 → 4 → 5</li>
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<li>进步分数：5 - 2 = 3</li>
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</ul>
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</li>
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<li><strong>未包含的员工：</strong>
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<ul>
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<li>David Wilson (employee_id = 4)：之前 3 次评估都是 4 分（没有进步）</li>
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<li>Emma Brown (employee_id = 5)：只有 2 次评估（需要至少 3 次）</li>
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</ul>
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</li>
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</ul>
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<p>输出表以 improvement_score 降序排序，然后以 name 升序排序。</p>
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</div>
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