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+<h2><a href="https://leetcode.com/problems/queries-quality-and-percentage/">1211. Queries Quality and Percentage</a></h2><h3>Easy</h3><hr><div class="sql-schema-wrapper__3VBi"><a class="sql-schema-link__3cEg">SQL Schema<svg viewBox="0 0 24 24" width="1em" height="1em" class="icon__1Md2"><path fill-rule="evenodd" d="M10 6L8.59 7.41 13.17 12l-4.58 4.59L10 18l6-6z"></path></svg></a></div><div><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>&nbsp;</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&nbsp;result format is in the following example.</p>
+
+<p>&nbsp;</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>
+</div>