> which one scale better , has a richer sql language , broader 
> implementation of sql standards ?

If you want to compare Derby with postgreSQL wrt. "richer sql language" and 
"broader implemntation of sql standards"
you may look at
    http://wiki.apache.org/db-derby/SQLvsDerbyFeatures
and
    http://www.postgresql.org/docs/8.1/interactive/features.html

Note of caution: It doesn't help you to choose the one with "broader"
or "richer" sql if the selected db does not meet your requirements.

-- 
Bernt Marius Johnsen, Database Technology Group, 
Staff Engineer, Technical Lead Derby/Java DB
Sun Microsystems, Trondheim, Norway

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