Mongodb 总结

--  查询 2017-07-24 那天 用户评论数降序排序

db.CommunityStoryComment.aggregate([    {$match: {"createTime":{$gte:ISODate("2017-07-24") , "$lt":ISODate("2017-07-25")}}},    {$group: {_id:"$senderId",count:{$sum: 1}} },     {$sort: {count: -1}}])

 db.col.find({"by":"菜鸟教程"}).pretty()                     where by = '菜鸟教程' db.col.find({"likes":{$lt:50}}).pretty()                 where likes < 50 db.col.find({"likes":{$lte:50}}).pretty()                 where likes <= 50 db.col.find({"likes":{$gt:50}}).pretty()                 where likes > 50 db.col.find({"likes":{$gte:50}}).pretty()                 where likes >= 50 db.col.find({"likes":{$ne:50}}).pretty()                 where likes != 50