db.{collection}.find({"lastUpdated": { "$gt" : ISODate("2013-07-12T18:41:50.362+09:00"), "$lt" : ISODate("2013-07-12T18:41:50.367+09:00") }})
var q = {"lastUpdated": { "$gt" : ISODate("2013-07-12T18:41:50.360+09:00"), "$lt" : ISODate("2013-07-12T18:41:50.367+09:00")}};
db.ssnwRenewalCode.find(q).count()
db.ssnwRenewalCode.find(q)
db.ssnwRenewalCode.remove(q)
db.ssnwRenewalCode.find(q).count()
db.{collection}.ensureIndex({"station_id" : 1});
mongoimport --db {dbname} --collection {collection name} --type csv --file "{file path}" --fields field1,field2,field3…```