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70 lines
2.2 KiB
HTML
70 lines
2.2 KiB
HTML
<p>销售表 <code>Sales</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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| sale_id | int |
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| product_id | int |
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| year | int |
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| quantity | int |
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| price | int |
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+-------------+-------+
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(sale_id, year) 是这张表的主键（具有唯一值的列的组合）。
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product_id 是产品表的外键（reference 列）。
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这张表的每一行都表示：编号 product_id 的产品在某一年的销售额。
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请注意，价格是按每单位计的。
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</pre>
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<p> </p>
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<p>产品表 <code>Product</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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+--------------+---------+
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product_id 是这张表的主键（具有唯一值的列）。
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这张表的每一行都标识：每个产品的 id 和 产品名称。</pre>
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<p> </p>
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<p>编写解决方案，选出每个售出过的产品 <strong>第一年</strong> 销售的 <strong>产品 id</strong>、<strong>年份</strong>、<strong>数量 </strong>和 <strong>价格</strong>。</p>
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<p>结果表中的条目可以按 <strong>任意顺序</strong> 排列。</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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Sales 表：
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+---------+------------+------+----------+-------+
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| sale_id | product_id | year | quantity | price |
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+---------+------------+------+----------+-------+
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| 1 | 100 | 2008 | 10 | 5000 |
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| 2 | 100 | 2009 | 12 | 5000 |
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| 7 | 200 | 2011 | 15 | 9000 |
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+---------+------------+------+----------+-------+
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Product 表：
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+------------+--------------+
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| product_id | product_name |
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+------------+--------------+
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| 100 | Nokia |
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| 200 | Apple |
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| 300 | Samsung |
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+------------+--------------+
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<strong>输出：</strong>
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+------------+------------+----------+-------+
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| product_id | first_year | quantity | price |
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+------------+------------+----------+-------+
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| 100 | 2008 | 10 | 5000 |
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| 200 | 2011 | 15 | 9000 |
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+------------+------------+----------+-------+</pre>
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