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86 lines
2.9 KiB
HTML
86 lines
2.9 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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| product_category | varchar |
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+------------------+---------+
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product_id 是该表主键(具有唯一值的列)。
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该表包含该公司产品的数据。
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</pre>
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<p> </p>
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<p>表: <code>Orders</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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| order_date | date |
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| unit | int |
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+---------------+---------+
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该表可能包含重复行。
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product_id 是表单 Products 的外键（reference 列）。
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unit 是在日期 order_date 内下单产品的数目。
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</pre>
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<p> </p>
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<p>写一个解决方案，要求获取在 2020 年 2 月份下单的数量不少于 100 的产品的名字和数目。</p>
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<p>返回结果表单的 <strong>顺序无要求 </strong>。</p>
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<p>查询结果的格式如下。</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 | product_name | product_category |
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+-------------+-----------------------+------------------+
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| 1 | Leetcode Solutions | Book |
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| 2 | Jewels of Stringology | Book |
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| 3 | HP | Laptop |
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| 4 | Lenovo | Laptop |
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| 5 | Leetcode Kit | T-shirt |
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+-------------+-----------------------+------------------+
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Orders 表:
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+--------------+--------------+----------+
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| product_id | order_date | unit |
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+--------------+--------------+----------+
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| 1 | 2020-02-05 | 60 |
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| 1 | 2020-02-10 | 70 |
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| 2 | 2020-01-18 | 30 |
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| 2 | 2020-02-11 | 80 |
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| 3 | 2020-02-17 | 2 |
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| 3 | 2020-02-24 | 3 |
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| 4 | 2020-03-01 | 20 |
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| 4 | 2020-03-04 | 30 |
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| 4 | 2020-03-04 | 60 |
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| 5 | 2020-02-25 | 50 |
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| 5 | 2020-02-27 | 50 |
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| 5 | 2020-03-01 | 50 |
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+--------------+--------------+----------+
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<strong>输出：</strong>
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+--------------------+---------+
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| product_name | unit |
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+--------------------+---------+
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| Leetcode Solutions | 130 |
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| Leetcode Kit | 100 |
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+--------------------+---------+
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<strong>解释：</strong>
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2020 年 2 月份下单 product_id = 1 的产品的数目总和为 (60 + 70) = 130 。
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2020 年 2 月份下单 product_id = 2 的产品的数目总和为 80 。
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2020 年 2 月份下单 product_id = 3 的产品的数目总和为 (2 + 3) = 5 。
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2020 年 2 月份 product_id = 4 的产品并没有下单。
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2020 年 2 月份下单 product_id = 5 的产品的数目总和为 (50 + 50) = 100 。</pre>
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