Template of an update using a for loop in plpgsql

template_update_using_forloop.sql

do $$
	declare
    	data_values record;
begin
   for data_values in (select * from table) 
   loop
	   update table
	    set column_value = (select column_value from another_table where id = data_values.id)
    	where id = data_values.id;
   end loop;
end;
$$ language plpgsql;