연습과제 1 db.movies.find({ title: { $regex: /er/ }}).count() 연습과제 2 db.movies.find( { year: { $gt: 2020 }}).count() 연습과제 3 db.movies.find({ year: { $gte: 2005, $lte: 2007 }}).count() 연습과제 4 db.movies.find({ genres: { $in: ["Comedy", "Horror"] }}).count() 연습과제 5 db.movies.find({ runtime: { $mod: [5, 0] }}).count() 연습과제 6 db.movies.find({ $and: [{ rating: { $gt: 7 } }, { year: { $gt: 2020 } }] }).cou..