db.topicInfo.group({
key: {"display_num": true},
initial: {"topic": 0},
reduce: function(cur, prev) {
prev.topic=prev.topic+1;
}
});
db.topicInfo.aggregate([{$group : {dinum : "$display_num", cout : {$sum : 1}}}])
mongodb group by
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转载自cooler1217.iteye.com/blog/2421965
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