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67 lines
1.5 KiB
HTML
67 lines
1.5 KiB
HTML
<p><code>Customer</code> 表：</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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| customer_id | int |
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| product_key | int |
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+-------------+---------+
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该表可能包含重复的行。
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customer_id 不为 NULL。
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product_key 是 Product 表的外键(reference 列)。
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</pre>
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<p><code>Product</code> 表：</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_key | int |
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+-------------+---------+
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product_key 是这张表的主键（具有唯一值的列）。
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</pre>
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<p> </p>
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<p>编写解决方案，报告 <code>Customer</code> 表中购买了 <code>Product</code> 表中所有产品的客户的 id。</p>
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<p>返回结果表 <strong>无顺序要求</strong> 。</p>
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<p>返回结果格式如下所示。</p>
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<p> </p>
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<p><strong>示例 1：</strong></p>
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<pre>
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<strong>输入：</strong>
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Customer 表：
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+-------------+-------------+
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| customer_id | product_key |
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+-------------+-------------+
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| 1 | 5 |
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| 2 | 6 |
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| 3 | 5 |
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| 3 | 6 |
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| 1 | 6 |
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+-------------+-------------+
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Product 表：
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+-------------+
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| product_key |
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+-------------+
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| 5 |
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| 6 |
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+-------------+
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<strong>输出：</strong>
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+-------------+
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| customer_id |
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+-------------+
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| 1 |
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| 3 |
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+-------------+
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<strong>解释：</strong>
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购买了所有产品（5 和 6）的客户的 id 是 1 和 3 。
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</pre>
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