Re: plpgsql: Bush becomes a null, can not execute null query

On Thu, 28 Aug 2003, Josh Goldberg wrote:

> Concatenating a null value makes the string null.  try:
> SELECT 'foo'||NULL||'bar';
>
> Just add a condition to check rivi.suoritus for null before making an
> assignment.

or better use coalesce

>
>
>
> Mauri Sahlberg wrote:
>
> >returns nothing - bush becomes null and everything fails. I do not
> >undestand why bush becomes null when the query returns nothing.
> >
> >
>
> >     bush:=''select * from PaivanLeimat('' ||
> >    quote_literal(aYritys) ||
> >    ''::varchar,'' ||
> >        quote_literal(nyt) ||
> >        ''::date,''||
> >        quote_literal(aKtunnus) ||
> >        ''::varchar,'' ||
> >        latest
> >        ||'')'';
> >
> >
> <snip>
>
> >     latest:=rivi.suoritus;
> >
> >
>
>
>
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    Regards,
        Oleg
_____________________________________________________________
Oleg Bartunov, sci.researcher, hostmaster of AstroNet,
Sternberg Astronomical Institute, Moscow University (Russia)
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