function corresponging to over in db2

Hi,

I have a query of the form "select min(tab1.a) over(partition by tab1.b
tab2.a tab1.c) from .....
in db2. What will be the corresponding query for postgres. Does Postgres
have a function which provides the same functionality??

Regards,
Vinita Bansal

_________________________________________________________________
Enhance your profile.
http://www.bharatmatrimony.com/cgi-bin/bmclicks1.cgi?74 Inform a prospective
life partner about the real you.