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leetcode-cn/problem (Chinese)/指定日期的产品价格 [product-price-at-a-given-date].html Normal file
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<p>产品数据表: <code>Products</code></p>
<pre>
+---------------+---------+
| Column Name | Type |
+---------------+---------+
| product_id | int |
| new_price | int |
| change_date | date |
+---------------+---------+
(product_id, change_date) 是此表的主键（具有唯一值的列组合）。
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>
<p>&nbsp;</p>
<p>编写一个解决方案，找出在&nbsp;<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&nbsp;<code>10</code><strong> 。</strong></p>
<p>以 <strong>任意顺序 </strong>返回结果表。</p>
<p>结果格式如下例所示。</p>
<p>&nbsp;</p>
<p><strong>示例 1:</strong></p>
<pre>
<strong>输入：</strong>
Products 表:
+------------+-----------+-------------+
| product_id | new_price | change_date |
+------------+-----------+-------------+
| 1 | 20 | 2019-08-14 |
| 2 | 50 | 2019-08-14 |
| 1 | 30 | 2019-08-15 |
| 1 | 35 | 2019-08-16 |
| 2 | 65 | 2019-08-17 |
| 3 | 20 | 2019-08-18 |
+------------+-----------+-------------+
<strong>输出：</strong>
+------------+-------+
| product_id | price |
+------------+-------+
| 2 | 50 |
| 1 | 35 |
| 3 | 10 |
+------------+-------+</pre>