select x.ename,y.dname, round(to_char(sysdate,'yyyy') - to_char(hiredate,'yyyy')) an_vechime
	from emp x,dept y where x.deptno = y.deptno and
				x.deptno = (select a.deptno from emp a
						having count(a.empno) in
						 (select max(count(empno)) from emp
							where (to_char(sysdate,'yyyy') - to_char(hiredate,'yyyy')) >20
							group by deptno
						 )
						group by a.deptno);