如何更改SQL veiw的条件值

试试：
with ADOQuery1 do
begin
Close;
SQL.clear;
SQL.Add('SELECT C.TYP_DESC,AVG(a.LICHTSTROM)AS AVG_LUMEN FROM LP_DATA a JOIN VPE b ON a.ID_VPE=b.ID_VPE
JOIN LP_TYPE c ON a.ID_TYP=c.ID_TYP WHERE b.DATUMUHRZEIT BETWEEN :d1 AND :d2 AND C.TYP_DESC=:ty
GROUP BY C.TYP_DESC');
Parameters[0].DataType:=ftDateTime;
Parameters[0].value:='2013/1/1 3:28:24';
Parameters[1].DataType:=ftDateTime;
Parameters[1].value:='2013/1/2 00:00:00';
Parameters[2].DataType:=ftstring;
Parameters[2].value:='A59809C00HM'
open;
end;