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leetcode/problem/consecutive-numbers.html

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+<p>Table: <code>Logs</code></p>
+
+<pre>
++-------------+---------+
+| Column Name | Type    |
++-------------+---------+
+| id          | int     |
+| num         | varchar |
++-------------+---------+
+id is the primary key for this table.
+</pre>
+
+<p>&nbsp;</p>
+
+<p>Write an SQL query to find all numbers that appear at least three times consecutively.</p>
+
+<p>Return the result table in <strong>any order</strong>.</p>
+
+<p>The query result format is in the following example.</p>
+
+<p>&nbsp;</p>
+<p><strong>Example 1:</strong></p>
+
+<pre>
+<strong>Input:</strong> 
+Logs table:
++----+-----+
+| id | num |
++----+-----+
+| 1  | 1   |
+| 2  | 1   |
+| 3  | 1   |
+| 4  | 2   |
+| 5  | 1   |
+| 6  | 2   |
+| 7  | 2   |
++----+-----+
+<strong>Output:</strong> 
++-----------------+
+| ConsecutiveNums |
++-----------------+
+| 1               |
++-----------------+
+<strong>Explanation:</strong> 1 is the only number that appears consecutively for at least three times.
+</pre>