create trigger on_update_data
after update ON datatable
for each row
begin
delete from historytable where gm_no = new.gm_no;
end;
¢Ñ datatable¿¡ updateÇÏ´Â ÀÚ·á°¡ »ý±ä´Ù¸é historytable¿¡ datatable¿¡ »õ·Î Àû¿ëµÈ gm_noÀÇ °ªÀ» °¡Áö°í
ÀÖ´Â ¸ðµç ·Î¿ì¸¦ »èÁ¦ÇÏ´Â Æ®¸®°Å »ç¿ë¿¹
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