execption with store procedure

HI!

how do i make the store procudere only exec when new data inserted in the other table? recently i hav use sp_procoption to make an autoexecution.... but it will insert the new data together with the old data
any suggestion?

CREATE PROCEDURE [P1] AS

INSERT INTO TABLE1

SELECT sa.NoMatriks, sa.SesiSem,
SUM(Nilai * KreditSubjek) / SUM(KreditSubjek) AS CPA,
SUM(KreditSubjek) AS JumKredit,
p.Agama, p.Aliran, p.Negeri, p.Kaum
FROM TblSubjekAmbil sa, TblSubjek s, TblGred g, TblPelajar p
WHERE sa.NoMatriks = p.NoMatriks AND
sa.KodSubjek = s.KodSubjek AND
sa.Gred = g.Gred
GROUP BY sa.NoMatriks, sa.SesiSem,
p.Agama, p.Aliran, p.Negeri,
p.Kaum (SELECT sa.NoMatriks, t1.NoMatriks
FROM TblSubjAmbil sa, TABLE1 t1
WHERE t1.NoMatriks <> sa.NoMatriks)

exec sp_makestartup N'P1'

exec sp_makestartup N'P1'

exec sp_makestartup N'P1'Databases have a great concept, called trigger. Just define an INSERT trigger for your table, and let that trigger execute your code or procedure.sql