set serveroutput on
<<bk>>
declare
  cnt pls_integer := 0;
begin
  select
    count(t1.employee_id)
  into
    bk.cnt
  from
    hr.employees t1;
--
  sys.dbms_output.put_line('Number of rows: ' || to_char(bk.cnt));
end;
/
set serveroutput off

SQL> set serveroutput on;
SQL>
SQL> DECLARE
  2     LV_RESULT SYS_REFCURSOR;
  3     TYPE EMP_TYP IS TABLE OF EMP%ROWTYPE;
  4     VAR_EMP EMP_TYP;
  5     CNT     NUMBER;
  6  BEGIN
  7     OPEN LV_RESULT FOR
  8        SELECT * FROM EMP;
  9     FETCH LV_RESULT BULK COLLECT
 10        INTO VAR_EMP;
 11     CLOSE LV_RESULT;
 12     CNT := VAR_EMP.COUNT;
 13     DBMS_OUTPUT.PUT_LINE('The employee count is :' || CNT);
 14  END;
 15  /
The employee count is :10
PL/SQL procedure successfully completed

SQL> set serveroutput off;
SQL>