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how to several records with same timestamp into one line?

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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

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