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51 lines
1.8 KiB
HTML
51 lines
1.8 KiB
HTML
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<p>表 <code>Activities</code>：</p>
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<pre>
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+-------------+---------+
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| 列名 | 类型 |
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+-------------+---------+
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| sell_date | date |
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| product | varchar |
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+-------------+---------+
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此表没有主键，它可能包含重复项。
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此表的每一行都包含产品名称和在市场上销售的日期。
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</pre>
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<p> </p>
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<p>编写一个 SQL 查询来查找每个日期、销售的不同产品的数量及其名称。<br />
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每个日期的销售产品名称应按词典序排列。<br />
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返回按 <code>sell_date</code> 排序的结果表。<br />
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查询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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<code><strong>输入：</strong>
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Activities</code> 表：
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+------------+-------------+
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| sell_date | product |
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+------------+-------------+
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| 2020-05-30 | Headphone |
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| 2020-06-01 | Pencil |
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| 2020-06-02 | Mask |
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| 2020-05-30 | Basketball |
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| 2020-06-01 | Bible |
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| 2020-06-02 | Mask |
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| 2020-05-30 | T-Shirt |
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+------------+-------------+
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<strong>输出：</strong>
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+------------+----------+------------------------------+
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| sell_date | num_sold | products |
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+------------+----------+------------------------------+
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| 2020-05-30 | 3 | Basketball,Headphone,T-shirt |
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| 2020-06-01 | 2 | Bible,Pencil |
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| 2020-06-02 | 1 | Mask |
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+------------+----------+------------------------------+
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<strong>解释：</strong>
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对于2020-05-30，出售的物品是 (Headphone, Basketball, T-shirt)，按词典序排列，并用逗号 ',' 分隔。
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对于2020-06-01，出售的物品是 (Pencil, Bible)，按词典序排列，并用逗号分隔。
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对于2020-06-02，出售的物品是 (Mask)，只需返回该物品名。</pre>
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