ник: snipe
Выражение1: IIf(Nz([quart_o];"")<>"" And Nz([appart_o];"")<>"";[house_o] & "/" & [quart_o] & "-" & [appart_o];IIf(Nz([quart_o];"")<>"" And Nz([appart_o];"")="";[house_o] & "/" & [quart_o];IIf(Nz([quart_o];"")="" And Nz([appart_o];"")<>"";[house_o] & "-" & [appart_o];[house_o])))
или так