2010/2/10 Yeb Havinga <yebhavinga@gmail.com>:
> Hello list,
>
> The Orafce compatibility package doesn't seem to have operators defined
> (looked in the sql load file). The function I'm specifically interested in,
> is Oracle's concatenation that regards a NULL as the empty string and hence
> returns 'the other value'. This in contrast with Pg's || that returns NULL
> if either of the operands is NULL. The Orafce package contains a concat
> function with Oracle behaviour, however an operator is missing.
>
> Having an associative operator has benefits over having only a function,
> since that would make translating expressions like 'monkey' || 'nut' || NULL
> easy.
>
> What about adding something like operator ||| in the orafce package for
> concat?
no, it could be confusing and it isn't enough, because it isn't only
|| or concat problem. On Oracle empty string is equal to NULL and NULL
is equal to empty string.
example: '' is null, length('')
http://www.thunderguy.com/semicolon/2003/04/26/oracle-empty-string-null/
so we are not able emulate this behave.
Regards
Pavel Stehule
>
> Regards,
> Yeb Havinga
>
>
> --
> Sent via pgsql-general mailing list (pgsql-general@postgresql.org)
> To make changes to your subscription:
> http://www.postgresql.org/mailpref/pgsql-general
>
