ممكن ينفذ بالجدول tbl_Employees بالحقلان Fondationatteignant-quorum و Fondation
ActiveFondation: IIf(IsNull([Fondationatteignant-quorum]) Or [Fondationatteignant-quorum]="";[Fondation];[Fondationatteignant-quorum])
والاستعلام كله هكذا
SELECT tbl_Employees.id_pers, tbl_Employees.date_engage, tbl_Employees.Fondation, tbl_Employees.Nom, tbl_Employees.Nom_Français, tbl_Employees.Prénom_Français, tbl_Employees.[Fondationatteignant-quorum], IIf(IsNull([Fondationatteignant-quorum]) Or [Fondationatteignant-quorum]="",[Fondation],[Fondationatteignant-quorum]) AS ActiveFondation
FROM tbl_Employees;