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                    delete from X  where a=:a
                    /
                    delete from Y  where a=:a
                    /
                    delete from Z  where a=:a

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adoquery1.SQL.Add('delete from a where a=''1''');
adoquery1.SQL.Add('delete from a where a=''2''');
adoquery1.SQL.Add('delete from a where a=''3''');
ADOQuery1.ExecSQL;




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