SELECT [01_Maandomzet].Jaar, [01_Maandomzet].Maandnr, [01_Maandomzet].Maand, [01_Maandomzet].Maandomzet, [01_Maandomzet].Budget, IIf([maandomzet]>=[Budget],"ja",IIf([maandomzet]<[Budget]*0.9,"nee","bijna")) AS MRP
FROM 01_Maandomzet
GROUP BY [01_Maandomzet].Jaar, [01_Maandomzet].Maandnr...