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144 lines
5.8 KiB
HTML
144 lines
5.8 KiB
HTML
<p>表：<code>stores</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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| store_id | int |
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| store_name | varchar |
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| location | varchar |
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+-------------+---------+
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store_id 是这张表的唯一主键。
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每一行包含有关商店及其位置的信息。
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</pre>
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<p>表：<code>inventory</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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| inventory_id| int |
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| store_id | int |
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| product_name| varchar |
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| quantity | int |
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| price | decimal |
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+-------------+---------+
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inventory_id 是这张表的唯一主键。
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每一行代表特定商店中某一特定产品的库存情况。
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</pre>
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<p>编写一个解决方案来查找库存不平衡的商店 - 即最贵商品的库存比最便宜商品少的商店。</p>
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<ul>
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<li>对于每个商店，识别 <strong>最贵的商品</strong>（最高价格）及其数量，如果有多个最贵的商品则选取数量最多的一个。</li>
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<li>对于每个商店，识别 <strong>最便宜的商品</strong>（最低价格）及其数量，如果有多个最便宜的物品则选取数量最多的一个。</li>
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<li>如果最贵商品的数量 <strong>少于</strong> 最便宜商品的数量，则商店存在库存不平衡。</li>
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<li>按（最便宜商品的数量/最贵商品的数量）计算 <strong>不平衡比</strong>。</li>
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<li>不平衡比 <strong>舍入到 2 位</strong> 小数</li>
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<li>结果只包含 <strong>至少有</strong><strong> </strong><code>3</code> <strong>个不同商品</strong> 的店铺</li>
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</ul>
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<p>返回结果表以不平衡比率降序排列，然后按商店名称升序排列。</p>
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<p>结果格式如下所示。</p>
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<p> </p>
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<p><strong class="example">示例：</strong></p>
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<div class="example-block">
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<p><strong>输入：</strong></p>
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<p>stores 表：</p>
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<pre class="example-io">
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+----------+----------------+-------------+
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| store_id | store_name | location |
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+----------+----------------+-------------+
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| 1 | Downtown Tech | New York |
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| 2 | Suburb Mall | Chicago |
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| 3 | City Center | Los Angeles |
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| 4 | Corner Shop | Miami |
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| 5 | Plaza Store | Seattle |
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+----------+----------------+-------------+
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</pre>
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<p>inventory 表：</p>
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<pre class="example-io">
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+--------------+----------+--------------+----------+--------+
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| inventory_id | store_id | product_name | quantity | price |
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+--------------+----------+--------------+----------+--------+
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| 1 | 1 | Laptop | 5 | 999.99 |
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| 2 | 1 | Mouse | 50 | 19.99 |
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| 3 | 1 | Keyboard | 25 | 79.99 |
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| 4 | 1 | Monitor | 15 | 299.99 |
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| 5 | 2 | Phone | 3 | 699.99 |
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| 6 | 2 | Charger | 100 | 25.99 |
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| 7 | 2 | Case | 75 | 15.99 |
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| 8 | 2 | Headphones | 20 | 149.99 |
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| 9 | 3 | Tablet | 2 | 499.99 |
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| 10 | 3 | Stylus | 80 | 29.99 |
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| 11 | 3 | Cover | 60 | 39.99 |
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| 12 | 4 | Watch | 10 | 299.99 |
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| 13 | 4 | Band | 25 | 49.99 |
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| 14 | 5 | Camera | 8 | 599.99 |
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| 15 | 5 | Lens | 12 | 199.99 |
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+--------------+----------+--------------+----------+--------+
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</pre>
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<p><strong>输出：</strong></p>
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<pre class="example-io">
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+----------+----------------+-------------+------------------+--------------------+------------------+
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| store_id | store_name | location | most_exp_product | cheapest_product | imbalance_ratio |
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+----------+----------------+-------------+------------------+--------------------+------------------+
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| 3 | City Center | Los Angeles | Tablet | Stylus | 40.00 |
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| 1 | Downtown Tech | New York | Laptop | Mouse | 10.00 |
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| 2 | Suburb Mall | Chicago | Phone | Case | 25.00 |
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+----------+----------------+-------------+------------------+--------------------+------------------+
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</pre>
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<p><strong>解释：</strong></p>
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<ul>
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<li><strong>Downtown Tech (store_id = 1)：</strong>
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<ul>
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<li>最贵的商品：笔记本（$999.99）数量为 5</li>
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<li>最便宜的商品：鼠标（$19.99）数量为 50</li>
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<li>库存不平衡：5 < 50（贵的商品的库存更少）</li>
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<li>不平衡比：50 / 5 = 10.00</li>
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<li>有 4 件商品（≥ 3），所以满足要求</li>
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</ul>
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</li>
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<li><strong>Suburb Mall (store_id = 2)：</strong>
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<ul>
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<li>最贵的商品：手机（$699.99）数量为 3</li>
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<li>最便宜的商品：保护壳（$15.99）数量为75</li>
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<li>库存不平衡：3 < 75（贵的商品的库存更少）</li>
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<li>不平衡比：75 / 3 = 25.00</li>
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<li>有 4 件商品（≥ 3），所以满足要求</li>
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</ul>
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</li>
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<li><strong>City Center (store_id = 3)：</strong>
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<ul>
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<li>最贵的商品：平板电脑（$499.99）数量为 2</li>
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<li>最便宜的商品：触控笔（$29.99）数量为 80</li>
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<li>不平衡比：2 < 80（贵的商品的库存更少）</li>
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<li>不平衡比：80 / 2 = 40.00</li>
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<li>有 3 件商品（≥ 3），所以满足要求</li>
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</ul>
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</li>
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<li><strong>未包含的商店：</strong>
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<ul>
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<li>Corner Shop（store_id = 4）：只有两件商品（手表，手环）- 不满足最少 3 件商品的要求</li>
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<li>Plaza Store（store_id = 5）：只有两件商品（相机，镜头）- 不满足最少 3 件商品的要求</li>
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</ul>
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</li>
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</ul>
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<p>结果表按不平衡比降序排序，然后以商店名升序排序。</p>
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</div>
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