PL/SQL : Simple Query with two sections

DECLARE                     -- Declaration section
v_ename emp.ename%type ;

BEGIN                        -- Execution section
Select ename into v_ename
from emp
where empno = '7219';

DBMS_OUTPUT.PUT_LINE(v_ename);

END;


INPUT : NA
OUTPUT : John (the corresponding ename for empno given will be displayed)