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 <it's raining cats and dogs :-) >, but if there are some more
values I get them all as well.

thanks

--------- Original Message --------
Da: Ben Kim <bkim(at)tamu(dot)edu>
To:
Cc: pgsql-admin(at)postgresql(dot)org
Oggetto: Re: [ADMIN] merge two rows where value are null
Data: 14/08/07 15:38

>
>
>
> On Tue, 14 Aug 2007, giuseppe(dot)derossi(at)email(dot)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)---------------------------
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>
>
>
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