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75 lines
2.5 KiB
HTML
75 lines
2.5 KiB
HTML
<p>Table: <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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| unit_price | int |
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+--------------+---------+
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Product_id是该表的主键。
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该表的每一行显示每个产品的名称和价格。
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</pre>
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<p>Table: <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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| seller_id | int |
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| product_id | int |
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| buyer_id | int |
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| sale_date | date |
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| quantity | int |
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| price | int |
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+------ ------+---------+
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这个表没有主键，它可以有重复的行。
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product_id 是 Product 表的外键。
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该表的每一行包含关于一个销售的一些信息。
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</pre>
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<p> </p>
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<p>编写一个SQL查询，报告<code>2019年春季</code>才售出的产品。即<strong>仅</strong>在<code><strong>2019-01-01</strong></code>至<code><strong>2019-03-31</strong></code>（含）之间出售的商品。</p>
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<p>以 <strong>任意顺序</strong> 返回结果表。</p>
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<p>查询结果格式如下所示。</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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Product table:
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+------------+--------------+------------+
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| product_id | product_name | unit_price |
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+------------+--------------+------------+
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| 1 | S8 | 1000 |
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| 2 | G4 | 800 |
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| 3 | iPhone | 1400 |
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+------------+--------------+------------+
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<code>Sales </code>table:
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+-----------+------------+----------+------------+----------+-------+
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| seller_id | product_id | buyer_id | sale_date | quantity | price |
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+-----------+------------+----------+------------+----------+-------+
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| 1 | 1 | 1 | 2019-01-21 | 2 | 2000 |
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| 1 | 2 | 2 | 2019-02-17 | 1 | 800 |
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| 2 | 2 | 3 | 2019-06-02 | 1 | 800 |
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| 3 | 3 | 4 | 2019-05-13 | 2 | 2800 |
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+-----------+------------+----------+------------+----------+-------+
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<strong>输出：</strong>
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+-------------+--------------+
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| product_id | product_name |
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+-------------+--------------+
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| 1 | S8 |
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+-------------+--------------+
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<strong>解释:</strong>
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id为1的产品仅在2019年春季销售。
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id为2的产品在2019年春季销售，但也在2019年春季之后销售。
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id 3的产品在2019年春季之后销售。
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我们只退回产品1，因为它是2019年春季才销售的产品。</pre>
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