SELECT katalog_katalogy.cena AS euro_cena,ciselnik_katalogy.datum FROM `katalog_katalogy`,`ciselnik_katalogy` where katalog_katalogy.id_katalog='00002331' and (`katalog_katalogy`.cena != '') and (`ciselnik_katalogy`.datum > 0) and katalog_katalogy.id_katalogy=ciselnik_katalogy.id UNION ALL SELECT euro_cena, datum FROM tt_jine_ceny WHERE (vyrobce='Loco') and (cis_kat='') ORDER BY datum;