select distinct flt.nazev from filtr flt join skupina sk on sk.id = flt.id_skupina where sk.menu = "A" and flt.id_skupina = "2" order by flt.poradi,flt.nazev
select distinct flt.nazev from filtr flt join skupina sk on sk.id = flt.id_skupina where sk.menu = "A" and flt.id_skupina = "3" order by flt.poradi,flt.nazev
select distinct flt.nazev from filtr flt join skupina sk on sk.id = flt.id_skupina where sk.menu = "A" and flt.id_skupina = "4" order by flt.poradi,flt.nazev