Evo i moje rjesenje.
Mada smatram da ako ima mnogo podataka rjesenje od @dexxxl ce najbrze raditi.
Code:
SELECT (SELECT max(Vrednost ) From Table1 as b where a.Rb>b.Rb) AS Naredni, [Vrednost]-[Naredni] AS Razlika, *
FROM Table1 AS a
WHERE (((SELECT max(Vrednost ) From Table1 as b where a.Rb>b.Rb)) Is Not Null);
zxz