Using analytical to find contiguous runs values

Hi all

I have a table which may appear like this:

create table TST as select 'key1' k, 1 double t;
Insert in TCT values ('key1', 2);
insert into values of tst ("key1", 3);
Insert in TCT values ('key2', 4);
Insert in TCT values ('key2', 5);
Insert in TCT values ('key1', 6);
Insert in TCT values ('key3', 7);
insert into values of tst ("key3", 8);
insert into values of tst ("key3", 9);
Insert in TCT values ('key2', 10);
insert into values of tst ("key1", 11);


I want to order by t
I want to have a third column which increments each time k Exchange when orderd by t:

Key1, 1, 1
Key1, 2, 1
Key1, 3, 1
Key2, 4, 2
Key2, 5, 2
Key1, 6: 3
Key3, 7, 4
Key3, 8, 4
Key3, 9: 4
Key2, 10, 5
Key1, 11, 6


for example I want to identify the extent of k, when ordered by t

Note that l does not have to be progressive by one every time:


Key3, 8, 4
Key3, 9: 4
Key2, 10, 5
Key1, 11, 6
Key1, 13: 6
Key1, 17, 6
Key2, 19: 7

I had hoped that with the help of an analytic function might be self-referential, but it seems logical that it cannot:
SELECT
  k, t, 
  --when the k of this row = k of prev row, use prev row's contig_id else add one, and make it this row;s contig_id
  case when k = lag(k) over(order by t) then lag(contig_id) over(order by t) else lag(contig_id) over(order by t) + 1 end as contig_id
I also tried to create a sequence:
create sequence dseq;
SELECT
  k, t, 
  --when the k of this row = k of prev row, use seq currval else use seq nextval
  case when k = lag(k) over(order by t) then dseq.currval else dseq.nextval end as contig_id
While this code does not work, I hope, it helps to illustrate my goal


Also, I do not fear what the specifier of contiguous block. I've used here a number that increments, but I wouldn't be all that uniquely identifies a contiguous block of k. Finally, I want to produce a report as well:


from_t, to_t, k
1, 3, key1
4, 5, key2
6, 6, key1
7, 9, key3
10: 10, key2
11: 17, key1





So if you can jump directly to that, that would be great. I had considered this sql to do this:
SELECT
  min(t) as from_t,
  max(t as to_t,
  max(k) as k,
FROM
  <subquery>
GROUP BY
  contiguous_identifier
I'm wrong just get a unique identifier for each contiguous block of k

Hello

SQL> select * from tst;

K             T
---- ----------
key1          1
key1          2
key1          3
key2          4
key2          5
key1          6
key3          7
key3          8
key3          9
key2         10
key1         11
key1         15
key1         17
key3         19

14 rows selected.

SQL> with RNs as (
  2    select tst.*,
  3      row_number() over(order by t) as rn_t,
  4      row_number() over (order by k, t) as rn_k_t
  5    from tst
  6  )
  7  select min(t) as from_t,
  8         max(t) as to_t,
  9         k
 10  from RNs
 11  group by k, rn_t - rn_k_t
 12  order by from_t
 13  ;

    FROM_T       TO_T K
---------- ---------- ----
         1          3 key1
         4          5 key2
         6          6 key1
         7          9 key3
        10         10 key2
        11         17 key1
        19         19 key3

7 rows selected.

Kind regards
Dima

Tags: Database

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