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118 lines
4.9 KiB
HTML
118 lines
4.9 KiB
HTML
<p>表：<code>UserActivity</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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| user_id | int |
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| activity_date | date |
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| activity_type | varchar |
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| activity_duration| int |
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+------------------+---------+
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(user_id, activity_date, activity_type) 是这张表的唯一主键。
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activity_type 是('free_trial', 'paid', 'cancelled')中的一个。
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activity_duration 是用户当天在平台上花费的分钟数。
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每一行表示一个用户在特定日期的活动。
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</pre>
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<p>订阅服务想要分析用户行为模式。公司提供7天免费试用，试用结束后，用户可以选择订阅 <strong>付费计划</strong> 或 <strong>取消</strong>。编写解决方案：</p>
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<ol>
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<li>查找从免费试用转为付费订阅的用户</li>
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<li>计算每位用户在 <strong>免费试用</strong> 期间的 <strong>平均每日活动时长</strong>（四舍五入至小数点后 <code>2</code> 位）</li>
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<li>计算每位用户在 <strong>付费</strong> 订阅期间的 <strong>平均每日活动时长</strong>（四舍五入到小数点后 <code>2</code> 位）</li>
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</ol>
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<p>返回结果表以<em> </em><code>user_id</code><em> </em><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>UserActivity 表：</p>
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<pre class="example-io">
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+---------+---------------+---------------+-------------------+
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| user_id | activity_date | activity_type | activity_duration |
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+---------+---------------+---------------+-------------------+
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| 1 | 2023-01-01 | free_trial | 45 |
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| 1 | 2023-01-02 | free_trial | 30 |
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| 1 | 2023-01-05 | free_trial | 60 |
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| 1 | 2023-01-10 | paid | 75 |
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| 1 | 2023-01-12 | paid | 90 |
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| 1 | 2023-01-15 | paid | 65 |
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| 2 | 2023-02-01 | free_trial | 55 |
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| 2 | 2023-02-03 | free_trial | 25 |
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| 2 | 2023-02-07 | free_trial | 50 |
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| 2 | 2023-02-10 | cancelled | 0 |
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| 3 | 2023-03-05 | free_trial | 70 |
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| 3 | 2023-03-06 | free_trial | 60 |
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| 3 | 2023-03-08 | free_trial | 80 |
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| 3 | 2023-03-12 | paid | 50 |
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| 3 | 2023-03-15 | paid | 55 |
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| 3 | 2023-03-20 | paid | 85 |
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| 4 | 2023-04-01 | free_trial | 40 |
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| 4 | 2023-04-03 | free_trial | 35 |
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| 4 | 2023-04-05 | paid | 45 |
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| 4 | 2023-04-07 | cancelled | 0 |
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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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| user_id | trial_avg_duration | paid_avg_duration |
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+---------+--------------------+-------------------+
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| 1 | 45.00 | 76.67 |
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| 3 | 70.00 | 63.33 |
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| 4 | 37.50 | 45.00 |
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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>用户 1:</strong>
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<ul>
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<li>体验了 3 天免费试用，时长分别为 45，30 和 60 分钟。</li>
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<li>平均试用时长：(45 + 30 + 60) / 3 = 45.00 分钟。</li>
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<li>拥有 3 天付费订阅，时长分别为 75，90 和 65分钟。</li>
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<li>平均花费市场：(75 + 90 + 65) / 3 = 76.67 分钟。</li>
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</ul>
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</li>
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<li><strong>用户 2:</strong>
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<ul>
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<li>体验了 3 天免费试用，时长分别为 55，25 和 50 分钟。</li>
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<li>平均试用时长：(55 + 25 + 50) / 3 = 43.33 分钟。</li>
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<li>没有转为付费订阅（只有 free_trial 和 cancelled 活动）。</li>
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<li>未包含在输出中，因为他未转换为付费用户。</li>
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</ul>
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</li>
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<li><strong>用户 3:</strong>
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<ul>
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<li>体验了 3 天免费试用，时长分别为 70，60 和 80 分钟。</li>
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<li>平均试用时长：(70 + 60 + 80) / 3 = 70.00 分钟。</li>
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<li>拥有 3 天付费订阅，时长分别为 50，55 和 85 分钟。</li>
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<li>平均花费时长：(50 + 55 + 85) / 3 = 63.33 分钟。</li>
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</ul>
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</li>
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<li><strong>用户 4:</strong>
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<ul>
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<li>体验了 2 天免费试用，时长分别为 40 和 35 分钟。</li>
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<li>平均试用时长：(40 + 35) / 2 = 37.50 分钟。</li>
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<li>在取消前有 1 天的付费订阅，时长为45分钟。</li>
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<li>平均花费时长：45.00 分钟。</li>
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</ul>
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</li>
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</ul>
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<p>结果表仅包括从免费试用转为付费订阅的用户（用户 1，3 和 4），并且以 user_id 升序排序。</p>
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</div>
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