On Thu, Jul 22, 2010 at 11:31:23AM +0000, Tim Landscheidt wrote: > Richard Huxton <d...@archonet.com> wrote: > > >>> What I want to get is the values grouped by "subset", where a subset is a > >>> set of rows with identical column until the colum changes. > >>> Is there a way to get > > >>> | 2 | B | > >>> | 4 | C | > >>> | 4 | B | > >>> | 3 | D | > > >>> by SQL only? > > >> I think, the problem is that there are 2 identical groups. I think, you > >> can write a pl/pgsql-proc, selecting all ordered by the date-field and > >> walking through the result to do the grouping, checking if the 2nd > >> column is different from the previous. > > >> With plain SQL it's maybe possible too, but i don't know how ... > > > It should be do-able in 8.4 onwards, look into windowing > > functions. In particular the lag() function: > > > SELECT > > mycode, > > mydate, > > lag(mycode) OVER (ORDER BY mydate) AS prev_code > > FROM > > mytable > > ORDER BY mydate; > > > It should be possible to use that as a subquery with an > > outer query that compares mycode=prev_code to get a run > > length. > > Hmmm. Can the outer query be done without using "WITH > RECURSIVE"?
How about this:
select
a, b, c, d, sum
from (
select
a, b, c, d, new_partition,
sum(e) over (partition by partition_num)
from (
select
a, b, c, d, e,
case when
lag(a, 1, null) over (order by d) is null or
lag(a, 1, null) over (order by d) != a or
lag(b, 1, null) over (order by d) is null or
lag(b, 1, null) over (order by d) != b or
lag(c, 1, null) over (order by d) is null or
lag(c, 1, null) over (order by d) != c
then nextval('a')
else currval('a')
end as partition_num,
case when
lag(a, 1, null) over (order by d) is null or
lag(a, 1, null) over (order by d) != a or
lag(b, 1, null) over (order by d) is null or
lag(b, 1, null) over (order by d) != b or
lag(c, 1, null) over (order by d) is null or
lag(c, 1, null) over (order by d) != c
then 'T'::boolean
else 'f'::boolean
end as new_partition
from foo
) bar
) baz
where
new_partition;
Here's my test table:
5432 j...@postgres# select * from foo;
a | b | c | d | e
---+---+---+------------------------+---
1 | 9 | 1 | 2007-01-01 00:00:05-07 | 8
9 | 2 | 1 | 2007-01-01 00:00:10-07 | 4
9 | 2 | 1 | 2007-01-01 00:00:15-07 | 6
9 | 2 | 1 | 2007-01-01 00:00:20-07 | 2
6 | 5 | 7 | 2007-01-01 00:00:25-07 | 3
4 | 9 | 0 | 2007-01-01 00:00:30-07 | 0
4 | 9 | 0 | 2007-01-01 00:00:35-07 | 7
5 | 2 | 7 | 2007-01-01 00:01:25-07 | 7
5 | 2 | 7 | 2007-01-01 00:01:30-07 | 7
5 | 2 | 7 | 2007-01-01 00:01:35-07 | 9
5 | 2 | 7 | 2007-01-01 00:01:40-07 | 2
5 | 2 | 7 | 2007-01-01 00:01:45-07 | 5
5 | 2 | 7 | 2007-01-01 00:01:50-07 | 8
5 | 2 | 7 | 2007-01-01 00:01:55-07 | 5
5 | 2 | 7 | 2007-01-01 00:02:00-07 | 9
7 | 8 | 8 | 2007-01-01 00:02:05-07 | 7
7 | 8 | 8 | 2007-01-01 00:02:10-07 | 8
9 | 3 | 0 | 2007-01-01 00:02:15-07 | 0
9 | 3 | 0 | 2007-01-01 00:02:20-07 | 8
9 | 2 | 1 | 2007-01-01 00:02:25-07 | 3
9 | 2 | 1 | 2007-01-01 00:02:30-07 | 3
(21 rows)
...and these results...
a | b | c | d | sum
---+---+---+------------------------+-----
1 | 9 | 1 | 2007-01-01 00:00:05-07 | 8
9 | 2 | 1 | 2007-01-01 00:00:10-07 | 12
6 | 5 | 7 | 2007-01-01 00:00:25-07 | 3
4 | 9 | 0 | 2007-01-01 00:00:30-07 | 7
5 | 2 | 7 | 2007-01-01 00:01:25-07 | 52
7 | 8 | 8 | 2007-01-01 00:02:05-07 | 15
9 | 3 | 0 | 2007-01-01 00:02:15-07 | 8
9 | 2 | 1 | 2007-01-01 00:02:25-07 | 6
(8 rows)
--
Joshua Tolley / eggyknap
End Point Corporation
http://www.endpoint.com
signature.asc
Description: Digital signature
