// find all athletes that play tennis
var query = Athlete.find({ 'sport': 'Tennis' });
// selecting the 'name' and 'age' fields
query.select('name age');
// limit our results to 5 items
query.limit(5);
// sort by age
query.sort({ age: -1 });
// execute the query at a later time
query.exec(function (err, athletes) {
if (err) return handleError(err);
// athletes contains an ordered list of 5 athletes who play Tennis
})