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select * from dual
select distinct a.hshsj,a.spmch
from spkfk a
join spkfk b on a.hshsj=b.hshsj
and a.spid<>b.spid
procedure TFrm_AddSQL.FormCreate(Sender: TObject);
var
i:integer;
str:string;
begin
ADOQuery1.Close;
ADOQuery1.SQL.Clear;
ADOQuery1.SQL.Add('select 类型名称 from SQL类型表');
try
ADOQuery1.Open;
ADOQuery1.First;
select * from dual