Re: merge two rows where value are null

Thanks for the suggestion, 
I was studying a solution which foresees the 'case when' construct...
now I can use it in addition to  array_to_string . In fact my solution
failed too if , but if there are some more
values I get them all as well.
 
thanks

	--------- Original Message --------
	Da: Ben Kim 
	To: 
	        Cc: pgsql-admin@postgresql.org
	Oggetto: Re: [ADMIN] merge two rows where value are null
	Data: 14/08/07 15:38
	
	> 
> 
> 
> On Tue, 14 Aug 2007, giuseppe.derossi@email.it wrote:
> 
> > Name, Surname , Job, Hobby, Pet, address
> > John, Smith,   NULL, photo, NULL, NULL
> > John, Smith,   student, NULL, cat, NULL
> 
> > by using name and surname as selecting key, I want :
> >
> > John, Smith,   student, photo, cat, NULL
> 
> If you are sure there's no conflict (multiple values) for a (name,
>    surname) key, one simple solution might be (surely not an efficient
one)
> 
> select 
> (select distinct Name from thetable where Name = 'name1' and Surname =
'surname1' where Name is not null),
> (select distinct Surname from thetable where Name = 'name1' and Surname =
'surname1' where Surname is not null),
> (select distinct Job from thetable where Name = 'name1' and Surname =
'surname1' where Job is not null),
> (select distinct Hobby from thetable where Name = 'name1' and Surname =
'surname1' where Hobby is not null),
> (select distinct Pet from thetable where Name = 'name1' and Surname =
'surname1' where Pet is not null),
> (select distinct address from thetable where Name = 'name1' and Surname =
'surname1' where address is not null)
> 
> This will fail if you also have 
> John, Smith,   student, NULL, dog, NULL
> 
> in addition to 
> > John, Smith,   student, NULL, cat, NULL
> 
> You can test for offending rows by:
> 
> select 
> array_to_string( array( select distinct Pet from thetable where Name =
'name1' and Surname = 'surname1' where Pet is not null),',')
> 
> and so on...
> 
> 
> Regards,
> 
> Ben K.
> Developer
> http://benix.tamu.edu
> 
> ---------------------------(end of broadcast)---------------------------
> TIP 5: don't forget to increase your free space map settings
> 
> 
>  
 --
 Email.it, the professional e-mail, gratis per te: http://www.email.it/f
 
 Sponsor:
 Hai bisogno di contanti per realizzare i tuoi desideri? Prometeo ti propone
prestiti da 1.500 a 31.000 Euro! Clicca qui per un preventivo immediato.
 Clicca qui: http://adv.email.it/cgi-bin/foclick.cgi?mid=6916&d=20070814