declare 
  cnt int; 
begin 
  execute immediate 'create private temporary table ora$ptt_tmp (id int)'; 
   
  execute immediate 'insert into ora$ptt_tmp values (55)'; 
  execute immediate 'insert into ora$ptt_tmp values (66)'; 
  execute immediate 'insert into ora$ptt_tmp values (77)'; 
   
  execute immediate 'select count(*) from ora$ptt_tmp' into cnt; 
  dbms_output.put_line(cnt); 
   
  execute immediate 'delete from ora$ptt_tmp where id = 66'; 
  cnt := 0; 
   
  execute immediate 'select count(*) from ora$ptt_tmp' into cnt; 
  dbms_output.put_line(cnt); 
end;