Updating database records in a loop?

Question

declare
begin
  for i in (select * from emp)
  loop
    if i.sal=1300 then
      update emp
      set sal=13000;
    end if;
  end loop;
end;

This code

Answer 1

This code is updating all the records with salary 13000. Instead i want to update records having salary 1300 to the value 13000.

for every record i am checking the sal value of that record.. if salary value in a particular record is 1500 i want to update it to 15000..

So what exactly do you want?

You want to update only 1,500 salary, you issue:

UPDATE emp
SET sal = 15000
WHERE sal = 1500;

You want to increase all salary ten times, you issue:

UPDATE emp
SET sal = sal * 10;