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procedure TForm4.FormShow(Sender: TObject);
begin
  with dataa.ADOQuery2 do
  begin
    Close;
    SQL.Clear;
    SQL.Add('select ²Ù×÷Ô±±àºÅ,²Ù×÷Ô±ÐÕÃû,²Ù×÷Ô±ÃÜÂë,²Ù×÷Ô±¼¶±ð = Case ²Ù×÷Ô±¼¶±ð when 1 then ''ϵͳ¹ÜÀíÔ±'' when 2 then ''²Ù×÷Ô±'' end from ²Ù×÷Ô±ÐÅÏ¢±í');
    Open;
  end;
  if Dataa.ADOQuery2.RecordCount>0 then
    DataSource1.DataSet := Dataa.ADOQuery2
  else
    DataSource1.DataSet := Nil;
  Combobox1.ItemIndex := 0 ;
  Button1.SetFocus;
end;
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Èç¹ûÎÒû¼Ç´í£¬accessûÓÐCase then £¬ºÃÏñÓÐiif£¬markÒ»ÏÂÏÈ

ÊÔÊÔ£º
'select ²Ù×÷Ô±±àºÅ,²Ù×÷Ô±ÐÕÃû,²Ù×÷Ô±ÃÜÂë,²Ù×÷Ô±¼¶±ð =iif(²Ù×÷Ô±¼¶±ð=1,''ϵͳ¹ÜÀíÔ±'',''²Ù×÷Ô±'' ) from ²Ù×÷Ô±ÐÅÏ¢±í'

×¢Ò⣺ÕâÀï²Ù×÷Ô±¼¶±ð·Ç1¾ÍÊDzÙ×÷Ô±£¬·ñÔò:
'select ²Ù×÷Ô±±àºÅ,²Ù×÷Ô±ÐÕÃû,²Ù×÷Ô±ÃÜÂë,²Ù×÷Ô±¼¶±ð =iif(²Ù×÷Ô±¼¶±ð=1,''ϵͳ¹ÜÀíÔ±'',iif (²Ù×÷Ô±¼¶±ð=2,''²Ù×÷Ô±'','ÆäËüÈËÔ±) ) from ²Ù×÷Ô±ÐÅÏ¢±í'



'select ²Ù×÷Ô±±àºÅ,²Ù×÷Ô±ÐÕÃû,²Ù×÷Ô±ÃÜÂë,²Ù×÷Ô±¼¶±ð =iif(²Ù×÷Ô±¼¶±ð=1,''ϵͳ¹ÜÀíÔ±'',''²Ù×÷Ô±'' ) from ²Ù×÷Ô±ÐÅÏ¢±í'
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