leetcode 180. Consecutive Numbers 解题思路

题目如下：

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.

发现网上的大多数思路都用到了自定义变量，并且比较麻烦

个人解题的时候用了个土办法。

如下：

select distinct Num as ConsecutiveNums  from Logs as l
where l.num = 
(select num from Logs as p where l.id+2=p.id )
&&
l.num = 
(select num from Logs as p where l.id+1=p.id )

简单粗暴- -。判断连续三个是否num相等。