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47 lines
1.4 KiB
HTML
47 lines
1.4 KiB
HTML
<p>产品数据表: <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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| new_price | int |
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| change_date | date |
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+---------------+---------+
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(product_id, change_date) 是此表的主键（具有唯一值的列组合）。
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这张表的每一行分别记录了 某产品 在某个日期 更改后 的新价格。</pre>
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<p> </p>
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<p>编写一个解决方案，找出在 <code>2019-08-16</code><strong> </strong>时全部产品的价格，假设所有产品在修改前的价格都是 <code>10</code><strong> 。</strong></p>
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<p>以 <strong>任意顺序 </strong>返回结果表。</p>
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<p>结果格式如下例所示。</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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Products 表:
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+------------+-----------+-------------+
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| product_id | new_price | change_date |
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+------------+-----------+-------------+
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| 1 | 20 | 2019-08-14 |
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| 2 | 50 | 2019-08-14 |
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| 1 | 30 | 2019-08-15 |
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| 1 | 35 | 2019-08-16 |
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| 2 | 65 | 2019-08-17 |
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| 3 | 20 | 2019-08-18 |
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+------------+-----------+-------------+
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<strong>输出：</strong>
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+------------+-------+
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| product_id | price |
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+------------+-------+
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| 2 | 50 |
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| 1 | 35 |
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| 3 | 10 |
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+------------+-------+</pre>
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