Špatný dotaz: Unknown column 'dny' 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(dny-otevrenych-dveri-20142015-6-unora-prijimaci-zkousky-nanecisto) or exists(select * from prispevek_kategorie pk where pk.id_prispevek = prispevek.id and pk.id_kategorie in (dny-otevrenych-dveri-20142015-6-unora-prijimaci-zkousky-nanecisto))) order by datum DESC ,id DESC