Howdy, Rainer.
Please advice me,
The dates always follow that sequential pattern?
Or can be holes on the dates sequence?
Best,
Oliveiros
----- Original Message -----
From: "Rainer Stengele" <rainer.steng...@diplan.de>
To: <pgsql-sql@postgresql.org>
Sent: Thursday, July 22, 2010 9:09 AM
Subject: [SQL] grouping subsets
Hi,
having a table similar to
| 1 | B | [2010-07-15 Do] |
| 1 | B | [2010-07-16 Fr] |
|---+---+-----------------|
| 2 | C | [2010-07-17 Sa] |
| 2 | C | [2010-07-18 So] |
|---+---+-----------------|
| 1 | B | [2010-07-19 Mo] |
| 1 | B | [2010-07-20 Di] |
| 1 | B | [2010-07-21 Mi] |
| 1 | B | [2010-07-22 Do] |
|---+---+-----------------|
| 3 | D | [2010-07-23 Fr] |
a simple group by gives me:
| 6 | B |
| 4 | C |
| 3 | D |
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?
- Rainer
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