mongoDB日常操作01

//serialno_info.i,查看历史最大值

db.serialno_info.find({'_id':'define_picture'})

//查看文件记录有序id条数

db.fs.files.find({$where:"(this._id.length < 10)"}).count()

//查看文件记录id有序且文件类型为pdf条数

db.fs.files.find({$where:"(this._id.length < 10)",'filename':{$regex:'pdf'}}).count()

//查看文件系统有序id条数

db.fs.chunks.find({$where:"(this.files_id.length < 10)"}).count()

//查看文件记录id有序且在文件系统中无对应记录 的所有记录

db.fs.files.find({$where:"(this._id.length < 10)",'_id':{$nin:db.fs.chunks.distinct('files_id')}})

//查看文件系统id有序且在文件记录中无对应纪录 的所有记录

db.fs.chunks.find({$where:"(this.files_id.length < 10)",'files_id':{$nin:db.fs.files.distinct('_id')}})



//customer_info   cwd_customer_info.protocol

db.customer_info.find({'cwd_customer_info.protocol':{$exists:true}},{'cwd_customer_info.protocol':1})

//customer_info   jzd_customer_info.o2

db.customer_info.find({'jzd_customer_info.o2':{$exists:true}},{'jzd_customer_info.o2':1})

//customer_info   yfd_customer_info.customer_info.protocol

db.customer_info.find({'yfd_customer_info.customer_info.protocol':{$exists:true}},{'yfd_customer_info.customer_info.protocol':1})

//students_idnyc_info students_idnyc_info.o1

db.students_idnyc_info.find({'students_idnyc_info.o1':{$exists:true}},{'students_idnyc_info.o1':1})

//partner_smk_oder partner_smk_order.o1

db.partner_smk_oder.find({'partner_smk_order.o1':{$exists:true}},{'partner_smk_order.o1':1})

//pxfq_business_info pxfq_business_info.protocol

db.pxfq_business_info.find({'pxfq_business_info.sign_protocol':{$exists:true}},{'pxfq_business_info.sign_protocol':1})

//customer_info   customer_info.protocol

db.customer_info.find({'customer_info.protocol':{$exists:true}},{'customer_info.protocol':1})

//customer_info   customer_info.o1

db.customer_info.find({'customer_info.o1':{$exists:true}},{'customer_info.o1':1})

//customer_info   zffq_customer_info.o1

db.customer_info.find({'zffq_customer_info.o1':{$exists:true}},{'zffq_customer_info.o1':1})

//partner_customer_info partner_customer_info.[*].o1

统计测额人数
db.customer_info.find({'customer_info.market':'ERWED','customer_info.l':{$exists:true}}).count()

测额总量
db.customer_info.aggregate([
{
    '$match':{'customer_info.market':'ERWED'}
},
{
    '$group':{
        '_id': null,
        'sum':{$sum:'$customer_info.l'}
        }
}
])

对字符大于小于做条件查询
db.lcpt_group_info.find({
    $where:'this.lcpt_group_info.cgsize && parseInt(this.lcpt_group_info.cgsize) >= 4'
    })


去重查询，json形式，如果要去重查询总数，在后面加  .values.length
db.runCommand({'distinct':'erwed_customer_info','key':'erwed_customer_info.company_name'}).values.length