merge into stkcode a using (select * from stkcode t where t.change_type='1')b on (a.id=b.id and a.stock_code=b.stock_code) update set a.change_type=b.change_type||',2' where a.change_type='1'; commit;
merge into stkcode a using (select * from stkcode t where t.change_type='1')b on (a.id=b.id and a.stock_code=b.stock_code) update set a.change_type=b.change_type||',2' where a.change_type='1'; commit;