mysql 之 求连续出现的数字

mysql 之 求连续出现的数字

id	num
1	1
2	1
3	1
4	2
5	1
6	2
7	2

题目：有结构如上的表tb,求连续出现次数大于2次的num
sql:

select distinct Num 
from(
    select Num,c,count(1)
    from(
        select Num,if(rn>Id,rn-Id,-(Id-rn)) as c
        from(
        select Id,
            Num,
            row_number() over(partition by key1 order by Num,Id) as rn
        from
        (
            select Id,Num, 1 as key1
            from Logs
        ) t
        )yu
    )t1
    group by Num,c
    having count(1)>=3
) t2;

结果：

num
1

无需进行连接操作，仅排序即可