mirror of
https://gitee.com/coder-xiaomo/leetcode-problemset
synced 2025-11-04 03:33:12 +08:00
70 lines
2.5 KiB
HTML
70 lines
2.5 KiB
HTML
<p>Table: <code>Queries</code></p>
|
|
|
|
<pre>
|
|
+-------------+---------+
|
|
| Column Name | Type |
|
|
+-------------+---------+
|
|
| query_name | varchar |
|
|
| result | varchar |
|
|
| position | int |
|
|
| rating | int |
|
|
+-------------+---------+
|
|
This table may have duplicate rows.
|
|
This table contains information collected from some queries on a database.
|
|
The <code>position</code> column has a value from <strong>1</strong> to <strong>500</strong>.
|
|
The <code>rating</code> column has a value from <strong>1</strong> to <strong>5</strong>. Query with <code>rating</code> less than 3 is a poor query.
|
|
</pre>
|
|
|
|
<p> </p>
|
|
|
|
<p>We define query <code>quality</code> as:</p>
|
|
|
|
<blockquote>
|
|
<p>The average of the ratio between query rating and its position.</p>
|
|
</blockquote>
|
|
|
|
<p>We also define <code>poor query percentage</code> as:</p>
|
|
|
|
<blockquote>
|
|
<p>The percentage of all queries with rating less than 3.</p>
|
|
</blockquote>
|
|
|
|
<p>Write a solution to find each <code>query_name</code>, the <code>quality</code> and <code>poor_query_percentage</code>.</p>
|
|
|
|
<p>Both <code>quality</code> and <code>poor_query_percentage</code> should be <strong>rounded to 2 decimal places</strong>.</p>
|
|
|
|
<p>Return the result table in <strong>any order</strong>.</p>
|
|
|
|
<p>The result format is in the following example.</p>
|
|
|
|
<p> </p>
|
|
<p><strong class="example">Example 1:</strong></p>
|
|
|
|
<pre>
|
|
<strong>Input:</strong>
|
|
Queries table:
|
|
+------------+-------------------+----------+--------+
|
|
| query_name | result | position | rating |
|
|
+------------+-------------------+----------+--------+
|
|
| Dog | Golden Retriever | 1 | 5 |
|
|
| Dog | German Shepherd | 2 | 5 |
|
|
| Dog | Mule | 200 | 1 |
|
|
| Cat | Shirazi | 5 | 2 |
|
|
| Cat | Siamese | 3 | 3 |
|
|
| Cat | Sphynx | 7 | 4 |
|
|
+------------+-------------------+----------+--------+
|
|
<strong>Output:</strong>
|
|
+------------+---------+-----------------------+
|
|
| query_name | quality | poor_query_percentage |
|
|
+------------+---------+-----------------------+
|
|
| Dog | 2.50 | 33.33 |
|
|
| Cat | 0.66 | 33.33 |
|
|
+------------+---------+-----------------------+
|
|
<strong>Explanation:</strong>
|
|
Dog queries quality is ((5 / 1) + (5 / 2) + (1 / 200)) / 3 = 2.50
|
|
Dog queries poor_ query_percentage is (1 / 3) * 100 = 33.33
|
|
|
|
Cat queries quality equals ((2 / 5) + (3 / 3) + (4 / 7)) / 3 = 0.66
|
|
Cat queries poor_ query_percentage is (1 / 3) * 100 = 33.33
|
|
</pre>
|