UPDATE tmp91skl5 s, cenik c
 SET s.nomenkla = c.nomenkla
 ,s.naz_dru = c.naz_dru
 ,s.naz_odru = c.naz_odru
 ,s.stupen = c.stupen
 ,s.druh = c.druh
 ,s.odruda = c.odruda
 where s.druh=c.druh
 and s.odruda=c.odruda
 and UPPER(s.stupen)=UPPER(c.stupen)
 and UPPER(s.mj)=UPPER(c.mj)
