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leetcode-cn/problem (Chinese)/查找僵尸会话 [find-zombie-sessions].html
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leetcode-cn/problem (Chinese)/查找僵尸会话 [find-zombie-sessions].html
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<p>表：<code>app_events</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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| event_id | int |
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| user_id | int |
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| event_timestamp | datetime |
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| event_type | varchar |
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| session_id | varchar |
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| event_value | int |
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+------------------+----------+
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event_id 是这张表的唯一主键。
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event_type 可以是 app_open，click，scroll，purchase 或 app_close。
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session_id 将事件按同一用户会话分组。
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event_value 表示：对于 purchase - 美元金额，对于 scroll - 滚动的像素数，对于其它 - NULL。
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</pre>
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<p>编写一个解决方案来识别 <strong>僵尸会话</strong>，即用户看似活跃但表现出异常行为模式的会话。如果会话满足以下所有条件，则被视为 <strong>僵尸会话</strong>：</p>
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<ul>
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<li>会话时长 <strong>超过</strong> <code>30</code> 分钟。</li>
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<li>至少有 <code>5</code> 次滚动事件。</li>
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<li>点击滚动比率低于 <code>0.20</code>。</li>
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<li>会话期间 <strong>没有进行任何购买</strong>。</li>
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</ul>
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<p>返回结果表按 <code>scroll_count</code> <strong>降序</strong> 排序，然后按 <code>session_id</code> <strong>升序</strong> 排序。</p>
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<p>返回格式如下所示。</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>app_events 表：</p>
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<pre class="example-io">
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+----------+---------+---------------------+------------+------------+-------------+
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| event_id | user_id | event_timestamp | event_type | session_id | event_value |
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+----------+---------+---------------------+------------+------------+-------------+
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| 1 | 201 | 2024-03-01 10:00:00 | app_open | S001 | NULL |
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| 2 | 201 | 2024-03-01 10:05:00 | scroll | S001 | 500 |
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| 3 | 201 | 2024-03-01 10:10:00 | scroll | S001 | 750 |
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| 4 | 201 | 2024-03-01 10:15:00 | scroll | S001 | 600 |
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| 5 | 201 | 2024-03-01 10:20:00 | scroll | S001 | 800 |
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| 6 | 201 | 2024-03-01 10:25:00 | scroll | S001 | 550 |
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| 7 | 201 | 2024-03-01 10:30:00 | scroll | S001 | 900 |
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| 8 | 201 | 2024-03-01 10:35:00 | app_close | S001 | NULL |
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| 9 | 202 | 2024-03-01 11:00:00 | app_open | S002 | NULL |
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| 10 | 202 | 2024-03-01 11:02:00 | click | S002 | NULL |
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| 11 | 202 | 2024-03-01 11:05:00 | scroll | S002 | 400 |
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| 12 | 202 | 2024-03-01 11:08:00 | click | S002 | NULL |
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| 13 | 202 | 2024-03-01 11:10:00 | scroll | S002 | 350 |
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| 14 | 202 | 2024-03-01 11:15:00 | purchase | S002 | 50 |
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| 15 | 202 | 2024-03-01 11:20:00 | app_close | S002 | NULL |
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| 16 | 203 | 2024-03-01 12:00:00 | app_open | S003 | NULL |
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| 17 | 203 | 2024-03-01 12:10:00 | scroll | S003 | 1000 |
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| 18 | 203 | 2024-03-01 12:20:00 | scroll | S003 | 1200 |
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| 19 | 203 | 2024-03-01 12:25:00 | click | S003 | NULL |
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| 20 | 203 | 2024-03-01 12:30:00 | scroll | S003 | 800 |
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| 21 | 203 | 2024-03-01 12:40:00 | scroll | S003 | 900 |
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| 22 | 203 | 2024-03-01 12:50:00 | scroll | S003 | 1100 |
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| 23 | 203 | 2024-03-01 13:00:00 | app_close | S003 | NULL |
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| 24 | 204 | 2024-03-01 14:00:00 | app_open | S004 | NULL |
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| 25 | 204 | 2024-03-01 14:05:00 | scroll | S004 | 600 |
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| 26 | 204 | 2024-03-01 14:08:00 | scroll | S004 | 700 |
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| 27 | 204 | 2024-03-01 14:10:00 | click | S004 | NULL |
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| 28 | 204 | 2024-03-01 14:12:00 | app_close | S004 | NULL |
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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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| session_id | user_id | session_duration_minutes | scroll_count |
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+------------+---------+--------------------------+--------------+
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| S001 | 201 | 35 | 6 |
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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>会话 S001 (User 201)</strong>:
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<ul>
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<li>时长：10:00:00 到 10:35:00 = 35 分钟（大于 30 分钟）</li>
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<li>滚动事件：6（至少 5 次）</li>
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<li>点击事件：0</li>
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<li>点击滚动比率：0/6 = 0.00（少于 0.20）</li>
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<li>购买数：0（没有购买）</li>
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<li>S001 是一个僵尸会话（满足所有条件）</li>
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</ul>
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</li>
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<li><strong>会话 S002 (User 202)</strong>:
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<ul>
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<li>时长：11:00:00 到 11:20:00 = 20 分钟（少于 30 分钟）</li>
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<li>有一次购买事件</li>
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<li>S002 不是一个僵尸会话</li>
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</ul>
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</li>
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<li><strong>会话 S003 (User 203)</strong>:
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<ul>
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<li>时长：12:00:00 到 13:00:00 = 60 分钟（超过 30 分钟）</li>
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<li>滚动事件：5（至少 5 次）</li>
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<li>点击事件：1</li>
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<li>点击滚动比率：1/5 = 0.20（不少于 0.20）</li>
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<li>购买数：0（没有购买）</li>
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<li>S003 不是一个僵尸会话（点击滚动比率等于 0.20，需要更少）。</li>
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</ul>
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</li>
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<li><strong>会话 S004 (User 204)</strong>:
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<ul>
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<li>时长：14:00:00 到 14:12:00 = 12 分钟（少于 30 分钟）</li>
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<li>滚动事件：2（少于 5 次）</li>
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<li>S004 不是一个僵尸会话</li>
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</ul>
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</li>
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</ul>
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<p>结果表按 scroll_count 降序排序，然后按 session_id 升序排序。</p>
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</div>
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