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What query operators are available?
| Comparison | | $gt, $gte, $in, $lt, $lte, $ne, $nin
Example: db.customers.find({acct_balance:{$gte:100000}}) |
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| Logical | | $and, $or, $not, $nor
Example: db.customers.find({$and:[{status:"AAA"},{gender:"F"}]}) |
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| Element | | $exists, $type
Example: db.test.find({b:{$exists:false}}) |
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More info: docs.mongodb.org/manual/reference/operator/query/
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