找出表中连续出现次数最多的值

如何解决找出表中连续出现次数最多的值

create table Launches (Id int,Name char)

insert into Launches values
(1,'A'),(2,(3,'B'),(4,(5,(6,(7,'C'),(8,(9,'B')

结果应该是

4 - B

从 3 到 6

类似问题-

Count Number of Consecutive Occurrence of values in Table

解决方法

您可以为每个 name 减去一个枚举值，以获得相同的相邻值的常量。剩下的就是聚合：

select top (1) name,count(*),min(id),max(id)
from (select l.*,row_number() over (partition by name order by id) as seqnum
      from #Launches l
     ) l
group by (id - seqnum),name
order by count(*) desc;

Here 是一个 dbfiddle。