// equals to
db.books.find({year: {$eq: 2016}})

// less than
db.books.find({year: {$lt: 2010}})

// less than or equal to
db.books.find({year: {$lte: 2008}})

// greater than
db.books.find({year: {$gt: 2014}})

// greater than or equal to
db.books.find({year: {$gte: 2008}})

// not equal to
db.books.find({year: {$ne: 2008}})

// value in
db.books.find({year: {$in: [2008, 2016]}})

// value not in
db.books.find({year: {$nin: [2008, 2016]}})