a handy way to reduce the size of the returned documents

    db.movieDetails.find({rated: "PG"}, {title: 1})

    db.movieDetails.find({rated: "PG"}, {title: 1, _id: 0})

    // show all the fields, except these
    db.movieDetails.find({rated: "PG"}, {_id: 0, awards: 0, writers: 0}).pretty()