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So, MongoDB defaults to “AND” when finding records. For example:
db.users.find({age: {'$gte': 30}, {'$lte': 40}});
The above query finds users >= 30 AND <= 40 years old.
How would I find users <= 30 OR >= 40 years old?
There will be an or operator in the near future. The nightly Mongodb build has already an $or. You can also use $where and use JavaScript to express the or.
See http://groups.google.com/group/mongodb-user/browse_thread/thread/a9a4d8b863d84601