Simple Query [Q]

hi,

how can i find the deptno that contains most staff and the number of staff in that dept from the following relation by a single query in sqlplus ?

staff deptno
------ --------

staff1		d1
staff2		d1
staff3		d2
staff4		d2
staff5		d2
staff6		d3
staff7		d3
staff8		d3
staff9		d4

so sqlplus would return

deptno		no of staff
-------		------------
d2		3
d3		3

thx for help :>

• ckkan