Example: EditRangeStart, EditRangeEnd, FieldByName, ApplyRange

To get result set where Company field value lays between Edit1 and Edit2:

with Customer do
begin
  EditRangeStart;

  // Set start range based on text of Edit1 component

  FieldByName('Company').AsString := Edit1.Text; 
  EditRangeEnd;

  // Set end range based on value of Edit2 component

  FieldByName('Company').AsString := Edit2.Text; 
  ApplyRange; // Apply the ranges
end;