query for distinct records

Question

Hello All,
I have a table named store_master in which store_name, manager,supervisor are the fields.
User have entered values as follows

store_name	manager	supervisor
mumbai	a	z
mumbai	b	z
mumbai	c	y
thane	d	x
thane	e	x
navi mumbai	f	w

Now I want distinct store_name followed by there last manager and supervisor.
Please help.
Regards,
Zuber Kazi