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73 lines
3.0 KiB
HTML
73 lines
3.0 KiB
HTML
<p>表：<code>products</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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| product_id | int |
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| product_name | varchar |
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| description | varchar |
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+--------------+------------+
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(product_id) 是这张表的唯一主键。
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这张表的每一行表示一个产品的唯一 ID，名字和描述。
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</pre>
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<p>编写一个解决方案来找到所有描述中 <strong>包含一个有效序列号</strong> 模式的产品。一个有效序列号符合下述规则：</p>
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<ul>
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<li>以 <strong>SN </strong>字母开头（区分大小写）。</li>
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<li>后面有恰好 <code>4</code> 位数字。</li>
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<li>接着是一个短横（-）， 短横后面还有另一组 <code>4</code> <strong>位数字</strong></li>
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<li>序列号必须在描述内（可能不在描述的开头）</li>
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</ul>
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<p>返回结果表以 <code>product_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>products 表：</p>
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<pre class="example-io">
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+------------+--------------+------------------------------------------------------+
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| product_id | product_name | description |
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+------------+--------------+------------------------------------------------------+
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| 1 | Widget A | This is a sample product with SN1234-5678 |
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| 2 | Widget B | A product with serial SN9876-1234 in the description |
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| 3 | Widget C | Product SN1234-56789 is available now |
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| 4 | Widget D | No serial number here |
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| 5 | Widget E | Check out SN4321-8765 in this description |
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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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| product_id | product_name | description |
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+------------+--------------+------------------------------------------------------+
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| 1 | Widget A | This is a sample product with SN1234-5678 |
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| 2 | Widget B | A product with serial SN9876-1234 in the description |
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| 5 | Widget E | Check out SN4321-8765 in this description |
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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>产品 1：</strong>有效的序列号 SN1234-5678</li>
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<li><strong>产品 2：</strong>有效的序列号 SN9876-1234</li>
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<li><strong>产品 3：</strong>无效的序列号 SN1234-56789（短横后包含 5 位数字）</li>
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<li><strong>产品 4：</strong>描述中没有序列号</li>
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<li><strong>产品 5：</strong>有效的序列号 SN4321-8765</li>
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</ul>
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<p>结果表以 product_id 升序排序。</p>
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</div>
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