数据提供
22
22
22
22
22
36
54
40
22
22
22
22
36
22
22
54
22
22
这是表格中的列。使用sql查询我们需要找出诸如的模式 22 36 54 40是第一个模式,然后22 36是第二个,22 54是第三个模式。
答案 0 :(得分:1)
您应该使用LEAD获取下一行的值以查看它是否为22,并使用它来删除列中的所有额外22。有这样的效果:
declare @t table (id int identity(1,1) not null, n int)
insert into @t
select 22 union all
select 22 union all
select 22 union all
select 22 union all
select 22 union all
select 36 union all
select 54 union all
select 40 union all
select 22 union all
select 22 union all
select 22 union all
select 22 union all
select 36 union all
select 22 union all
select 22 union all
select 54 union all
select 22 union all
select 22
select id,n from (select id,n ,lead(n) over (order by id)
as lead_val from @t ) t where n<>22 or lead_val<>22
输出:
5 22
6 36
7 54
8 40
12 22
13 36
15 22
16 54
答案 1 :(得分:0)
PostgreSQL
假设:
select array_to_string(array_agg(val order by i),',') as pattern
,min (i) as from_i
,max (i) as to_i
,count(*) as pattern_length
from (select i,val
,count(case when val = 22 then 1 end) over
(
order by i
rows unbounded preceding
) as pattern_id
from mytable
) t
group by pattern_id
having count(*)>1
;
+-------------+--------+------+----------------+
| pattern | from_i | to_i | pattern_length |
+-------------+--------+------+----------------+
| 22,36,54,40 | 5 | 8 | 4 |
| 22,36 | 12 | 13 | 2 |
| 22,54 | 15 | 16 | 2 |
+-------------+--------+------+----------------+