db={"user":[{"_id":1,"empid":"7"},{"_id":2,"empid":"6"},{"_id":3,"empid":"5"},{"_id":4,"empid":"9"},{"_id":5,"empid":"3"},{"_id":6,"empid":"2"},{"_id":7,"empid":"1"},{"_id":8,"empid":"10"},{"_id":9,"empid":"4"},{"_id":10,"empid":"8"}]}

db.user.find({"empid":{"$in":["1","2"]}})