db.employees.findOne()


db.people.insertOne({name: "Jayne", age:52, gender: "F"})


db.people.insertMany([{name: "Thomas", age: 20, gender: "M"}, {name:"Emily", age: 20, gender: "F", favTeam: "Swans"}])


db.people.find()


db.people.find({name: "Jayne"})


db.people.find({age: 20})


db.people.find({age: {$gte: 21} })


db.people.find({gender: "F", age: {$lte: 30} })


db.people.find({ 
    $or: [ 
        { age: { $lt: 20 } },
        { age: { $gt: 30 } }
    ] 
})


db.people.find({ $and: [ { age: { $gte: 20 } }, { age: { $lt: 30 } }] })


db.people.find({ 

    name: /^J/,
  
    gender: 'F',

    $or: [ 
        { age: { $lt: 20 } },
        { age: { $gt: 30 } }
    ] 
})


db.people.find(
    { name: 'Jayne' },
    { age: 1, gender: 1 }
)