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82 lines
2.4 KiB
HTML
82 lines
2.4 KiB
HTML
<p>Table: <code>Users</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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| user_id | int |
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| user_name | varchar |
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+-------------+---------+
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user_id is the primary key (column with unique values) for this table.
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Each row of this table contains the name and the id of a user.
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</pre>
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<p> </p>
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<p>Table: <code>Register</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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| contest_id | int |
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| user_id | int |
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+-------------+---------+
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(contest_id, user_id) is the primary key (combination of columns with unique values) for this table.
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Each row of this table contains the id of a user and the contest they registered into.
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</pre>
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<p> </p>
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<p>Write a solution to find the percentage of the users registered in each contest rounded to <strong>two decimals</strong>.</p>
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<p>Return the result table ordered by <code>percentage</code> in <strong>descending order</strong>. In case of a tie, order it by <code>contest_id</code> in <strong>ascending order</strong>.</p>
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<p>The result format is in the following example.</p>
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<p> </p>
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<p><strong class="example">Example 1:</strong></p>
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<pre>
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<strong>Input:</strong>
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Users table:
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+---------+-----------+
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| user_id | user_name |
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+---------+-----------+
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| 6 | Alice |
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| 2 | Bob |
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| 7 | Alex |
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+---------+-----------+
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Register table:
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+------------+---------+
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| contest_id | user_id |
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+------------+---------+
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| 215 | 6 |
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| 209 | 2 |
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| 208 | 2 |
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| 210 | 6 |
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| 208 | 6 |
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| 209 | 7 |
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| 209 | 6 |
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| 215 | 7 |
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| 208 | 7 |
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| 210 | 2 |
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| 207 | 2 |
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| 210 | 7 |
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+------------+---------+
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<strong>Output:</strong>
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+------------+------------+
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| contest_id | percentage |
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+------------+------------+
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| 208 | 100.0 |
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| 209 | 100.0 |
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| 210 | 100.0 |
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| 215 | 66.67 |
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| 207 | 33.33 |
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+------------+------------+
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<strong>Explanation:</strong>
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All the users registered in contests 208, 209, and 210. The percentage is 100% and we sort them in the answer table by contest_id in ascending order.
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Alice and Alex registered in contest 215 and the percentage is ((2/3) * 100) = 66.67%
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Bob registered in contest 207 and the percentage is ((1/3) * 100) = 33.33%
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</pre>
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