Is not null:
db.mycollection.find({"IMAGE URL":{$exists:true}});
db.mycollection.find({"IMAGE URL":{$ne:null}});
Between dates:
db.getCollection('tournament').find({"start_at": { $gte: ISODate("2015-06-24T00:00:00.000Z"), $lt: ISODate("2015-06-29T00:00:00.000Z")}})
Restore from folder:
mongorestore -d [your_db_name] [your_dump_dir] mongorestore --db electronic_prod electronic_prod/