Hi,
i've got a problem with PostgreSQL 7.3 (installed from distro rpms) running on SuSE 9.0. When I try to sum() large amoun of values, the query returns meaningless result, for example:

postgres=> select paese,populazione from nazioni;
paese |populazione
----------------+-----------
UNIONE SOVIETICA| 281170000
INDIA | 766140000
CINA | 1072220000
GIAPPONE | 129947000
CANADA' | 25610000
U.S.A. | 242080000
MESSICO | 81160000
BRASILE | 141450000
ARGENTINA | 31500000
(9 rows)

postgres=> select sum(populazione) from nazioni;
sum
-----------
-1523690296
(1 row)


Any suggestion/tip how to workaround it ?