방법 1:        
   sql1 = "select * from 고객사_MODEL현황";
   ==> sql1 = "select * from 고객사_MODEL현황 Where SEC(S-LSI) > "  ";
방법 2:
   AnsiString A = ADODataSet1->FieldByName("SEC(S-LSI)")->AsString
   if (A.Trim() < "     ") continue;
   ComboBox2->Items->Add(A);