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Thanks for the clarifications. I learned Prolog over a few weeks for a class I took a year ago. It left a favorable impression on me.

With respect to answering "multiple questions/queries", is it fair to draw a parallel with SQL?

I don't think so. Sql is declarative though and the engine does the imperative work for you. A simple example of multiple uses:

Simpsons = ['bart', 'lisa', 'homer'], member(X, Simpsons)?

will do a for each over the list, with X bound to each character.

and the same member definition can also be used to answer Simpsons = ['bart', 'lisa', 'homer'], member('brian griffin', Simpsons)?

Yes, yes it is. In fact, Picolisp's builtin database uses a built in prolog dialect as its query language.