On Thu, 11 Sep 2003, Alexander Blüm wrote:
> hello,
>
> I'm facing an odd problem.
> I have a query:
>
> SELECT "Kürzel", "Autor(en)", "Titel"
> FROM "tblTitelangaben"
> WHERE "Titel"||"Kürzel"||"Monographie-Kürzel"||"Autor(en)" ILIKE '%er%';
>
> this works like a charm.
>
> but if I add another ||"something" - which might be emtpy, I get no
> results.. why?
>
> WHERE
> "Titel"||"Kürzel"||"Monographie-Kürzel"||"Autor(en)"||"Herausgeber"
> ILIKE '%er%';
>
> || is the same as "OR", is it not?
No. Any component must not be NULL. Use coalesce("Herausgeber",'') to
ensure it's never NULL.