MongoDB - MapReduce 实战
map = function() { emit(this.school_number, this.ticket_number) };reduce = function(key, value){ return Array.sum(',' + value).slice(1); };
db.tickets.mapReduce(map, reduce, {out: {inline:1}})
db.tickets.mapReduce(map, reduce, {out: {inline:1}, query: {"school_bucket": "1"}})
db.tickets.mapReduce(map, reduce, {out: {inline:1}, query: {"school_number": "2719"}})
db.tickets.mapReduce(map, reduce, “output”)
db.output.find()
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