180. Consecutive Numbers

Write a SQL query to find all numbers that appear at least three times consecutively.

+----+-----+
| Id | Num |
+----+-----+
| 1  |  1  |
| 2  |  1  |
| 3  |  1  |
| 4  |  2  |
| 5  |  1  |
| 6  |  2  |
| 7  |  2  |
+----+-----+

For example, given the above Logs table, 1 is the only number that appears consecutively for at least three times.

+-----------------+
| ConsecutiveNums |
+-----------------+
| 1               |
+-----------------+
1 # Write your MySQL query statement below
2 SELECT DISTINCT a.num AS ConsecutiveNums
3 FROM Logs AS a, Logs AS b, Logs AS c
4 WHERE a.num = b.num AND b.num = c.num AND a.id + 1 = b.id AND b.id + 1 = c.id

 

posted @ 2020-02-12 14:59  hyx1  阅读(127)  评论(0编辑  收藏  举报