As you mention "some relational stuff can be emulated" - the DBI distribution now includes DBD::DBM which layers a DBI/SQL interface over any DBM file, including BerkeleyDB files. It can operate either directly on the file, or make use of MLDBM with a serilaization method of your choice (Storable, Data::Dumper, etc.). The SQL is limited, but certainly covers the kinds of aggregate functions you mention as well as several kinds of joins.
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