更新列名
db.Youzy_Stores.update({}, {$rename : {"StoreId" : "MetaId"}}, false, true)

查询长度
db.getCollection("Youzy_Stores_Navigations").find({$where:'this.StoreId.length>2'},{Name:0})

查询总条数
db.getCollection("Youzy_Stores_BusinessLogs").find({}).count()

区间查询
db.getCollection("Youzy_Cards").find({'StoreId':1139,'CardNo':{'$gte':'90225001','$lte':'90295000'}})

多个区间查询
db.getCollection("Youzy_Cards").find({ $or : [{ $and : [{"CardNo" : { $gte : "10000001" }}, {"CardNo" : { $lte : "10000003" }}] }, { $and : [{"CardNo" : { $gte : "10000006" }}, {"CardNo" : { $lte : "10000008" }}] }] }).limit(1000).skip(0) 

排序 1 升序  -1降序
db.getCollection("Youzy_Stores_BusinessLogs").find().sort({"CreationTime":1})

db.Youzy_Stores_Experts.find({'PicId' : { $type : 16 }}).forEach(function(x) {x.PicId = String(x.PicId);db.Youzy_Stores_Experts.save(x); })

添加一个字段.  table 代表表名 , 添加字段 content,字符串类型。
 db.table.update({}, {$set: {content:""}}, {multi: true})

删除一个字段
 db.table.update({},{$unset:{content:""}},false, true)

清空数据
db.table.remove({})

查询指定列
 db.news.find( {}, { id: 1, title: 1 } )

修改列表
db.getCollection('Youzy_Orders_Scores').update({},{$rename:{"OId":'MetaId'}},false,true) 

添加索引
db.test.createIndex({"username":1})
db.Youzy_Users_MobileAuthCodes.createIndex({"Code":1,"Mobile":1,"ExpiresTime":1},{"name":"MobileAuthCodes_Validate"})

//group
db.getCollection("Youzy_Users_GaoKaoScores").aggregate([{$match:{"IsDeleted":false}},{$group : {_id : "$UserId", count : {$sum : 1}}},{$sort:{"count":-1}}]) --条件修改

//update
db.getCollection('Youzy_Stores_Navigations').update( 
    // query 
    {
        "MenuKey" : 28
    }, 
    // update 
    {
        $set:{"Url":"/tzy/choosebatch?type=3"}
    },
    false,  
    true     
);
  
按照时间年月分组
db.Youzy_Users.aggregate([
 {$match: { CreateDate: { $gte: new Date('2018-01-01'), $lte: new Date('2019-07-31') }  }} ,
 {$group:{_id:{CreateDate:{year: { $year: "$CreateDate"},month: { $month: "$CreateDate" }}}, count: { $sum: 1 }}}
])

//分组
db.Youzy_Users.aggregate([
 {$match: { CreateDate: { $gte: new Date('2017-01-01'), $lte: new Date('2019-07-31') }}} ,
 {   "$group": {
                _id: {
        
                    month: {
                        $dateToString: {
                            format: "%Y-%m",
                            date: "$CreateDate"
                        }
                    }
                },
                 count: {
                     $sum: 1 
                }
            }
        },
        {
            "$project": {
                "年月": "$_id.month",
                "总数": "$count",
               
            }
        }
])