Also hab das jetzt wie folgt:

select id_bild,id_bild as bild,name,beschreibung,preis,
case
when(lagermenge) between 1 and 3 then 'ampel_gelb'
when(lagermenge) between 0 and 0 then 'ampel_rot'
else 'ampel_gruen'
end as status,
case
when(lagermenge) between 1 and 3 then '<a href="f?p=#OWNER#.wk_einfuegen?p_img_id=#BILD#&p_redirect_url=f?p=177:102:&SESSION::NO' || '">In den Warenkorb</a>'
when(lagermenge) = 0 then ''
when(lagermenge) > 3 then '<a href="f?p=#OWNER#.wk_einfuegen?p_img_id=#BILD#&p_redirect_url=f?p=177:102:&SESSION::NO' || '">In den Warenkorb</a>'
end as warenkorb
from bilder where id_fotograf=85

Fehlermeldung:
Error ERR-7620 Could not determine workspace for application ().

HuLa