db.col.find({reviews: {rating: {$gte: 5}}, price: {$gt: 100})

db.col.find({reviews:rating: {$gte: 5}, price: {$gt: 100}})

db.col.find({"reviews:rating": {$gte: 5} $and price: {$gt: 100}})

db.col.find({rating: {$gte: 5}, price: {$gt: 100}})

db.col.find({"reviews:rating": {$gte: 5}, price: {$gt: 100}})

db.users.drop({name : "Alex"})

db.users.delete({name : "Alex"})

db.users.update({name : "Alex"}, {name : null} )

db.users.remove({name :

"Alex"})

db.users.unset({name : "Alex"})

db.drop("some")

db.some.delete()

some.drop()

db.some.drop()

db.drop(some)

db.collection.Indexes();

db.collection.getIndexes();

db.collection.find(Indexes);

db.collection.ensurelndex()

db.collection.find(Indexes: {key: 1});

db.col.find ({ age: {$gt: 50}});

db.col.find ({ age: {$gt: 50, $lte: 60}});

db.col.find ({ age: {$gte: 50, $lte: 60}});

db.col.find ({ age: {$gt: 50, $lt: 60}});

db.col.find ({ age: {$gte: 50, $lt: 60}});

create db_name

set db_name

use db_name

make db_name

using db_name