how to several records with same timestamp into one line?
Hi everyone,
My data with same timestamp "2008-11-12 12:12:12" in postgresql are as
follows
rowid data unit channel create_on
------------------------------------------------------------------------------
1 1.5 MPa channel1 2008-11-12 12:12:12
2 2.5 M3 channel2 2008-11-12 12:12:12
3 3.5 M3 channel3 2008-11-12 12:12:12
4 4.5 t channel4 2008-11-12 12:12:12
------------------------------------------------------------------------------
I would like to "group" them into one line with SQL like
1.5 MPa 2.5 M3 3.5 M3 4.5 t 2008-11-12 12:12:12
The table is defined as
CREATE TABLE record_data
(
rowid serial NOT NULL,
data double precision,
unit character(10),
channel character(20),
create_on timestamp
)
Is that possible? Thanks for your help in advance.
Ouyang
am Wed, dem 12.11.2008, um 18:57:42 +0800 mailte zxo102 ouyang folgendes:
Hi everyone,
My data with same timestamp "2008-11-12 12:12:12" in postgresql are as
followsrowid data unit channel create_on
------------------------------------------------------------------------------
1 1.5 MPa channel1 2008-11-12 12:12:12
2 2.5 M3 channel2 2008-11-12 12:12:12
3 3.5 M3 channel3 2008-11-12 12:12:12
4 4.5 t channel4 2008-11-12 12:12:12
------------------------------------------------------------------------------I would like to "group" them into one line with SQL like
1.5 MPa 2.5 M3 3.5 M3 4.5 t 2008-11-12 12:12:12
Maybe you can create a new aggregate, for instance like there:
http://www.zigo.dhs.org/postgresql/#comma_aggregate
Regards, Andreas
--
Andreas Kretschmer
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