I don't use Datomic since it's closed source. But the design
is really, really cool.
Actually, Datalog is a subset of Prolog, and could be used on any kind of data, not necessarily database. Nowadays, it's implemented in different languages, just like the Clojure version.
So like SQL, Datalog it's a declarative language and implemented on different kinds of platforms but IMO it's much more reasonable than SQL since SQL is much worse on composition.
