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71 lines
2.6 KiB
HTML
71 lines
2.6 KiB
HTML
<p><code>Queries</code> 表： </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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| query_name | varchar |
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| result | varchar |
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| position | int |
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| rating | int |
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+-------------+---------+
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此表可能有重复的行。
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此表包含了一些从数据库中收集的查询信息。
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“位置”（<code>position</code>）列的值为 <strong>1</strong> 到 <strong>500</strong> 。
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“评分”（<code>rating</code>）列的值为 <strong>1</strong> 到 <strong>5</strong> 。评分小于 3 的查询被定义为质量很差的查询。
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</pre>
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<p> </p>
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<p>将查询结果的质量 <code>quality</code> 定义为：</p>
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<blockquote>
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<p>各查询结果的评分与其位置之间比率的平均值。</p>
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</blockquote>
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<p>将劣质查询百分比 <code>poor_query_percentage</code> 定义为：</p>
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<blockquote>
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<p>评分小于 3 的查询结果占全部查询结果的百分比。</p>
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</blockquote>
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<p>编写解决方案，找出每次的 <code>query_name</code> 、 <code>quality</code> 和 <code>poor_query_percentage</code>。</p>
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<p><code>quality</code> 和 <code>poor_query_percentage</code> 都应 <strong>四舍五入到小数点后两位</strong> 。</p>
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<p>以 <strong>任意顺序</strong> 返回结果表。</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>示例 1：</strong></p>
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<pre>
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<strong>输入：</strong>
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Queries table:
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+------------+-------------------+----------+--------+
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| query_name | result | position | rating |
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+------------+-------------------+----------+--------+
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| Dog | Golden Retriever | 1 | 5 |
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| Dog | German Shepherd | 2 | 5 |
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| Dog | Mule | 200 | 1 |
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| Cat | Shirazi | 5 | 2 |
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| Cat | Siamese | 3 | 3 |
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| Cat | Sphynx | 7 | 4 |
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+------------+-------------------+----------+--------+
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<strong>输出：</strong>
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+------------+---------+-----------------------+
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| query_name | quality | poor_query_percentage |
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+------------+---------+-----------------------+
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| Dog | 2.50 | 33.33 |
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| Cat | 0.66 | 33.33 |
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+------------+---------+-----------------------+
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<strong>解释：</strong>
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Dog 查询结果的质量为 ((5 / 1) + (5 / 2) + (1 / 200)) / 3 = 2.50
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Dog 查询结果的劣质查询百分比为 (1 / 3) * 100 = 33.33
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Cat 查询结果的质量为 ((2 / 5) + (3 / 3) + (4 / 7)) / 3 = 0.66
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Cat 查询结果的劣质查询百分比为 (1 / 3) * 100 = 33.33
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</pre>
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