database - updating on the basis of row num -

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hi want chunk data on basis of row num im failing when im trying update 

 declare  temp varchar2(50); low varchar2(50); upp varchar2(50); begin low :=0;  in ( select  to_char(floor(rownum/10) * 10) low, to_char(floor(rownum/10) * 10 + 10 -1 ) upp emp group floor(rownum/10) order floor(rownum/10)) loop     update emp set thd=2     rownum>i.low , rownum<i.upp;   commit;  low:=low+1;   dbms_output.put_line(i.low|| i.upp);   end loop; end;

the code updating first 10 rec correctly not updating next cycles 20-30 30-40

any guess why

in oracle pseudocolumn rownum returns number indicating order in oracle selects row table. can use rownum < n. rownum > n return empty result set. because first returned row rownum = 1 , expect > n. that's why no rows update. documentation

if have id in table can that:

merge emp e using (select * (select e2.*, row_number() on (order id) r emp e2) r > 10 , r < 21) d on (e.id = d.id) when matched update set thd = 2;

if don't have id can use cursor update.


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