declare  cursor c_update is    select b.acct_skid, a.acct_id      from opt_acct_fdim a, opt_acct_fdim_bkp b     where a.acct_id = b.acct_id;  v_counter number;begin  v_counter := 0;  for v_row in c_update loop    update opt_acct_fdim       set acct_skid = v_row.acct_skid     where acct_id = v_row.acct_id;   ---注意，这里没有rowid    v_counter := v_counter + 1;    if (v_counter >= 1000) then      commit;      v_counter := 0;    end if;    end loop;    commit;end;/