Thank you Josh for your answer.
I have read the sources of datalog, however, literal.clj and the ideas
of the query language behind it is unknown for me, thus I can not
understand it quite well. The same thing happens when I saw magic.clj,
in which file I saw "magic transformation".
I ran the example you posted on github, which seems return 2 records
because same room-id merged. However, if I want the result set look
like this: {room-id: 1 :seat-number [1 2], :players ["joe" "smith"]},
is it possible? Another question, there are many aggregate function in
SQL, can it be used in the conjunctive query?
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