declare
cnt number;
begin
dbms_output.put_line(rpad('table_name',35)||rpad('records',20));
dbms_output.put_line(rpad('---------------',35)||rpad('--------------',20) );
for rec in(select table_name from user_tables order by table_name) loop
execute immediate 'select count(*) from '||rec.table_name into cnt;
dbms_output.put_line(rpad(lower(rec.table_name),35)||rpad(cnt,20));
end loop;
end;
/