What's the exact expression?
newfield: Round((0,3-([field01]/[field02]))*[field02];0)
this function returns integer appx. 1-30, constant for every line. And this number is number of records that I need.
SQL query: SELECT adresy_jen_nove.*, adresy_nahodne_jeden_odkazdeho3_celkovypocet.pocet CATIkontr, adresy_jen_nove_celkovypocet.celkovypocet, Round((0.3-([pocetCATIkontr]/[celkovypocet]))*[celkovypocet],0) AS dovyber_pocet
FROM adresy_jen_nove, adresy_nahodne_jeden_odkazdeho3_celkovypocet, adresy_jen_nove_celkovypocet
WHERE (((adresy_jen_nove.ID) Not In (select id from adresy_nahodne_jeden_odkazdeho3_expdoCATI)))
ORDER BY adresy_jen_nove.typ, adresy_jen_nove.nahoda;