Špatný dotaz: Unknown column 'za' in 'where clause'
SELECT id,nazev,poradi,text,zkracene,url,id_kategorie,kod,datum,datum_zobrazovat FROM prispevek WHERE zobrazovat="A" AND (id_kategorie in(za-kulturnimi--a-prirodnimi-krasami-nitry) or exists(select * from prispevek_kategorie pk where pk.id_prispevek = prispevek.id and pk.id_kategorie in (za-kulturnimi--a-prirodnimi-krasami-nitry))) order by datum DESC ,id DESC