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117 lines
4.3 KiB
HTML
117 lines
4.3 KiB
HTML
<p>表：<code>customer_transactions</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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| transaction_id | int |
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| customer_id | int |
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| transaction_date | date |
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| amount | decimal |
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| transaction_type | varchar |
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+------------------+---------+
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transaction_id 是这张表的唯一主键。
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transaction_type 可以是 “purchase” 或 “refund”。
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</pre>
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<p>编写一个解决方案来查找 <strong>忠实客户</strong>。如果满足下述所有条件，可以认为该客户是 <strong>忠实</strong> 客户：</p>
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<ul>
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<li>进行了 <strong>至少</strong> <code><font face="monospace">3</font></code> 次购买交易。</li>
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<li>活跃了 <strong>至少</strong> <code>30</code> 天。</li>
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<li>他们的 <strong>退款率</strong> 少于 <code>20%</code>。</li>
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</ul>
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<p>返回结果表以 <code>customer_id</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>customer_transactions 表：</p>
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<pre class="example-io">
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+----------------+-------------+------------------+--------+------------------+
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| transaction_id | customer_id | transaction_date | amount | transaction_type |
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+----------------+-------------+------------------+--------+------------------+
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| 1 | 101 | 2024-01-05 | 150.00 | purchase |
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| 2 | 101 | 2024-01-15 | 200.00 | purchase |
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| 3 | 101 | 2024-02-10 | 180.00 | purchase |
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| 4 | 101 | 2024-02-20 | 250.00 | purchase |
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| 5 | 102 | 2024-01-10 | 100.00 | purchase |
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| 6 | 102 | 2024-01-12 | 120.00 | purchase |
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| 7 | 102 | 2024-01-15 | 80.00 | refund |
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| 8 | 102 | 2024-01-18 | 90.00 | refund |
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| 9 | 102 | 2024-02-15 | 130.00 | purchase |
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| 10 | 103 | 2024-01-01 | 500.00 | purchase |
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| 11 | 103 | 2024-01-02 | 450.00 | purchase |
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| 12 | 103 | 2024-01-03 | 400.00 | purchase |
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| 13 | 104 | 2024-01-01 | 200.00 | purchase |
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| 14 | 104 | 2024-02-01 | 250.00 | purchase |
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| 15 | 104 | 2024-02-15 | 300.00 | purchase |
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| 16 | 104 | 2024-03-01 | 350.00 | purchase |
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| 17 | 104 | 2024-03-10 | 280.00 | purchase |
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| 18 | 104 | 2024-03-15 | 100.00 | refund |
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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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| customer_id |
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+-------------+
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| 101 |
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| 104 |
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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>客户 101</strong>:
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<ul>
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<li>购买交易：4 (IDs: 1, 2, 3, 4) </li>
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<li>退款交易：0</li>
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<li>退款率：0/4 = 0%（少于 20%）</li>
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<li>活跃时期：1 月 5 日到 2 月 20 日 = 46 天（至少 30 天）</li>
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<li>符合忠诚客户条件</li>
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</ul>
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</li>
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<li><strong>客户 102</strong>:
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<ul>
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<li>购买交易：3 (IDs: 5, 6, 9) </li>
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<li>退款交易：2 (IDs: 7, 8)</li>
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<li>退款率：2/5 = 40% (超过 20%) </li>
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<li>不符合忠诚客户条件</li>
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</ul>
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</li>
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<li><strong>客户 103</strong>:
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<ul>
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<li>购买交易：3 (IDs: 10, 11, 12) </li>
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<li>退款交易：0</li>
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<li>退款率：0/3 = 0%（少于 20%）</li>
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<li>活跃时期：1 月 1 日到 1 月 3 日 = 2 天（少于 30 天）</li>
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<li>不符合忠诚客户条件</li>
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</ul>
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</li>
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<li><strong>客户 104</strong>:
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<ul>
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<li>购买交易：5 (IDs: 13, 14, 15, 16, 17) </li>
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<li>退款交易：1 (ID: 18)</li>
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<li>退款率：1/6 = 16.67%（少于 20%）</li>
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<li>活跃时期：1 月 1 日到 3 月 15 日 = 73 天（至少 30 天）</li>
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<li>符合忠诚客户条件</li>
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</ul>
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</li>
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</ul>
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<p>结果表以 customer_id 升序排序。</p>
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</div>
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