SELECT ID,
IIf(Nz([Alan1],"")<>"",1,0) + IIf(Nz([Alan2],"")<>"",1,0) + IIf(Nz([Alan3],"")<>"",1,0) + IIf(Nz([Alan4],"")<>"",1,0) + IIf(Nz([Alan5],"")<>"",1,0) + IIf(Nz([Alan6],"")<>"",1,0) + IIf(Nz([Alan7],"")<>"",1,0) + IIf(Nz([Alan8],"")<>"",1,0) + IIf(Nz([Alan9],"")<>"",1,0) + IIf(Nz([Alan10],"")<>"",1,0) AS DoluAlan From TAblonuz
şeklinde bir sorgu ile sayabilirsiniz.