===Chapter-1===

> db.unicorns.insert({name: 'Aurora',
...     gender: 'f', weight: 450})
> db.unicorns.find()
{ "_id" : ObjectId("526328ee7023ef178f1b6636"), "name" : "Aurora", "gender" : "f", "weight" : 450 }
>
> db.unicorns.find()
{ "_id" : ObjectId("526328ee7023ef178f1b6636"), "name" : "Aurora", "gender" : "f", "weight" : 450 }
>
>
> db.system.indexes.find()
{ "v" : 1, "key" : { "_id" : 1 }, "ns" : "test.nettuts", "name" : "_id_" }
{ "v" : 1, "key" : { "_id" : 1 }, "ns" : "test.unicorns", "name" : "_id_" }
>

>
> db.unicorns.insert({name: 'Leto',
...     gender: 'm',
...     home: 'Arrakeen',
...     worm: false})
>
>
> db.unicorns.find()
{ "_id" : ObjectId("526328ee7023ef178f1b6636"), "name" : "Aurora", "gender" : "f", "weight" : 450 }
{ "_id" : ObjectId("52632aa17023ef178f1b6637"), "name" : "Leto", "gender" : "m", "home" : "Arrakeen", "worm" : false }
>
>
>
>
> db.unicorns.remove()
>
>
> db.unicorns.insert({name: 'Horny',
...     dob: new Date(1992,2,13,7,47),
...     loves: ['carrot','papaya'],
...     weight: 600,
...     gender: 'm',
...     vampires: 63});
> db.unicorns.insert({name: 'Aurora',
...     dob: new Date(1991, 0, 24, 13, 0),
...     loves: ['carrot', 'grape'],
...     weight: 450,
...     gender: 'f',
...     vampires: 43});
> db.unicorns.insert({name: 'Unicrom',
...     dob: new Date(1973, 1, 9, 22, 10),
...     loves: ['energon', 'redbull'],
...     weight: 984,
...     gender: 'm',
...     vampires: 182});
> db.unicorns.insert({name: 'Roooooodles',
...     dob: new Date(1979, 7, 18, 18, 44),
...     loves: ['apple'],
...     weight: 575,
...     gender: 'm',
...     vampires: 99});
> db.unicorns.insert({name: 'Solnara',
...     dob: new Date(1985, 6, 4, 2, 1),
...     loves:['apple', 'carrot',
...         'chocolate'],
...     weight:550,
...     gender:'f',
...     vampires:80});
>     db.unicorns.insert({name:'Ayna',
...     dob: new Date(1998, 2, 7, 8, 30),
...     loves: ['strawberry', 'lemon'],
...     weight: 733,
...     gender: 'f',
...     vampires: 40});
> db.unicorns.insert({name:'Kenny',
...     dob: new Date(1997, 6, 1, 10, 42),
...     loves: ['grape', 'lemon'],
...     weight: 690,
...     gender: 'm',
...     vampires: 39});
> db.unicorns.insert({name: 'Raleigh',
...     dob: new Date(2005, 4, 3, 0, 57),
...     loves: ['apple', 'sugar'],
...     weight: 421,
...     gender: 'm',
...     vampires: 2});
> db.unicorns.insert({name: 'Leia',
...     dob: new Date(2001, 9, 8, 14, 53),
...     loves: ['apple', 'watermelon'],
...     weight: 601,
...     gender: 'f',
...     vampires: 33});
> db.unicorns.insert({name: 'Pilot',
...     dob: new Date(1997, 2, 1, 5, 3),
...     loves: ['apple', 'watermelon'],
...     weight: 650,
...     gender: 'm',
...     vampires: 54});
> db.unicorns.insert({name: 'Nimue',
...     dob: new Date(1999, 11, 20, 16, 15),
...     loves: ['grape', 'carrot'],
...     weight: 540,
...     gender: 'f'});
> db.unicorns.insert({name: 'Dunx',
...     dob: new Date(1976, 6, 18, 18, 18),
...     loves: ['grape', 'watermelon'],
...     weight: 704,
...     gender: 'm',
...     vampires: 165});
>
>
>
>
>
>
> db.unicorns.find({gender: 'm',
...     weight: {$gt: 700}})
{ "_id" : ObjectId("52632b757023ef178f1b663a"), "name" : "Unicrom", "dob" : ISODate("1973-02-10T03:10:00Z"), "loves" : [  "energon",  "redbull" ], "weight" : 984, "gender" : "m", "vampires" : 182 }
{ "_id" : ObjectId("52632b767023ef178f1b6643"), "name" : "Dunx", "dob" : ISODate("1976-07-18T22:18:00Z"), "loves" : [  "grape",  "watermelon" ], "weight" : 704, "gender" : "m", "vampires" : 165 }
> //or (not quite the same thing, but for
> //demonstration purposes)
> db.unicorns.find({gender: {$ne: 'f'},
...     weight: {$gte: 701}})
{ "_id" : ObjectId("52632b757023ef178f1b663a"), "name" : "Unicrom", "dob" : ISODate("1973-02-10T03:10:00Z"), "loves" : [  "energon",  "redbull" ], "weight" : 984, "gender" : "m", "vampires" : 182 }
{ "_id" : ObjectId("52632b767023ef178f1b6643"), "name" : "Dunx", "dob" : ISODate("1976-07-18T22:18:00Z"), "loves" : [  "grape",  "watermelon" ], "weight" : 704, "gender" : "m", "vampires" : 165 }
>
>
>
> db.unicorns.find({
...     vampires: {$exists: false}})
{ "_id" : ObjectId("52632b757023ef178f1b6642"), "name" : "Nimue", "dob" : ISODate("1999-12-20T21:15:00Z"), "loves" : [  "grape",  "carrot" ], "weight" : 540, "gender" : "f" }
>
>
> db.unicorns.find({gender: 'f',
...     $or: [{loves: 'apple'},
...         {loves: 'orange'},
...         {weight: {$lt: 500}}]})
{ "_id" : ObjectId("52632b757023ef178f1b6639"), "name" : "Aurora", "dob" : ISODate("1991-01-24T18:00:00Z"), "loves" : [  "carrot",  "grape" ], "weight" : 450, "gender" : "f", "vampires" : 43 }
{ "_id" : ObjectId("52632b757023ef178f1b663c"), "name" : "Solnara", "dob" : ISODate("1985-07-04T06:01:00Z"), "loves" : [  "apple",  "carrot",  "chocolate" ], "weight" : 550, "gender" : "f", "vampires" : 80 }
{ "_id" : ObjectId("52632b757023ef178f1b6640"), "name" : "Leia", "dob" : ISODate("2001-10-08T18:53:00Z"), "loves" : [  "apple",  "watermelon" ], "weight" : 601, "gender" : "f", "vampires" : 33 }
>
>
>
>
>
> db.unicorns.find(     {_id: ObjectId("52632b757023ef178f1b6640")})
{ "_id" : ObjectId("52632b757023ef178f1b6640"), "name" : "Leia", "dob" : ISODate("2001-10-08T18:53:00Z"), "loves" : [  "apple",  "watermelon" ], "weight" : 601, "gender" : "f", "vampires" : 33 }
>
>
>


===Chapter-2===


> db.unicorns.update({name: 'Roooooodles'},
...     {weight: 590})
>
>
> db.unicorns.remove()
>
>
> db.unicorns.insert({name: 'Horny',
...     dob: new Date(1992,2,13,7,47),
...     loves: ['carrot','papaya'],
...     weight: 600,
...     gender: 'm',
...     vampires: 63});
> db.unicorns.insert({name: 'Aurora',
...     dob: new Date(1991, 0, 24, 13, 0),
...     loves: ['carrot', 'grape'],
...     weight: 450,
...     gender: 'f',
...     vampires: 43});
> db.unicorns.insert({name: 'Unicrom',
...     dob: new Date(1973, 1, 9, 22, 10),
...     loves: ['energon', 'redbull'],
...     weight: 984,
...     gender: 'm',
...     vampires: 182});
> db.unicorns.insert({name: 'Roooooodles',
...     dob: new Date(1979, 7, 18, 18, 44),
...     loves: ['apple'],
...     weight: 575,
...     gender: 'm',
...     vampires: 99});
> db.unicorns.insert({name: 'Solnara',
...     dob: new Date(1985, 6, 4, 2, 1),
...     loves:['apple', 'carrot',
...         'chocolate'],
...     weight:550,
...     gender:'f',
...     vampires:80});
>     db.unicorns.insert({name:'Ayna',
...     dob: new Date(1998, 2, 7, 8, 30),
...     loves: ['strawberry', 'lemon'],
...     weight: 733,
...     gender: 'f',
...     vampires: 40});
> db.unicorns.insert({name:'Kenny',
...     dob: new Date(1997, 6, 1, 10, 42),
...     loves: ['grape', 'lemon'],
...     weight: 690,
...     gender: 'm',
...     vampires: 39});
> db.unicorns.insert({name: 'Raleigh',
...     dob: new Date(2005, 4, 3, 0, 57),
...     loves: ['apple', 'sugar'],
...     weight: 421,
...     gender: 'm',
...     vampires: 2});
> db.unicorns.insert({name: 'Leia',
...     dob: new Date(2001, 9, 8, 14, 53),
...     loves: ['apple', 'watermelon'],
...     weight: 601,
...     gender: 'f',
...     vampires: 33});
> db.unicorns.insert({name: 'Pilot',
...     dob: new Date(1997, 2, 1, 5, 3),
...     loves: ['apple', 'watermelon'],
...     weight: 650,
...     gender: 'm',
...     vampires: 54});
> db.unicorns.insert({name: 'Nimue',
...     dob: new Date(1999, 11, 20, 16, 15),
...     loves: ['grape', 'carrot'],
...     weight: 540,
...     gender: 'f'});
> db.unicorns.insert({name: 'Dunx',
...     dob: new Date(1976, 6, 18, 18, 18),
...     loves: ['grape', 'watermelon'],
...     weight: 704,
...     gender: 'm',
...     vampires: 165});
>
>
> db.unicorns.find({name: 'Roooooodles'})
{ "_id" : ObjectId("52632e567023ef178f1b6647"), "name" : "Roooooodles", "dob" : ISODate("1979-08-18T22:44:00Z"), "loves" : [  "apple" ], "weight" : 575, "gender" : "m", "vampires" : 99 }
>
>
> db.unicorns.update({weight: 590}, {$set: {
...     name: 'Roooooodles',
...     dob: new Date(1979, 7, 18, 18, 44),
...     loves: ['apple'],
...     gender: 'm',
...     vampires: 99}})
>
>
> db.unicorns.find({name: 'Roooooodles'})
{ "_id" : ObjectId("52632e567023ef178f1b6647"), "name" : "Roooooodles", "dob" : ISODate("1979-08-18T22:44:00Z"), "loves" : [  "apple" ], "weight" : 575, "gender" : "m", "vampires" : 99 }
>
>
>
>
>
> db.unicorns.update({name: 'Roooooodles'},
...     {$set: {weight: 590}})
>
>
> db.unicorns.update({name: 'Pilot'},
...     {$inc: {vampires: -2}})
>
>
> db.unicorns.update({name: 'Aurora'},
...     {$push: {loves: 'sugar'}})
>
>
> db.hits.update({page: 'unicorns'},
...     {$inc: {hits: 1}});
>
>
> db.hits.find();
>
>
> db.hits.update({page: 'unicorns'},
...     {$inc: {hits: 1}}, true);
> db.hits.find();
{ "_id" : ObjectId("52632fb2ffbaa916e910db30"), "hits" : 1, "page" : "unicorns" }
>
> db.hits.update({page: 'unicorns'},
...     {$inc: {hits: 1}}, true);
> db.hits.find();
{ "_id" : ObjectId("52632fb2ffbaa916e910db30"), "hits" : 2, "page" : "unicorns" }
>
>
>
>
>
> db.unicorns.update({},
...     {$set: {vaccinated: true }});
> db.unicorns.find({vaccinated: true});
{ "_id" : ObjectId("52632e567023ef178f1b6644"), "dob" : ISODate("1992-03-13T12:47:00Z"), "gender" : "m", "loves" : [  "carrot",  "papaya" ], "name" : "Horny", "vaccinated" : true, "vampires" : 63, "weight" : 600 }
>
>
>
> db.unicorns.update({},
...     {$set: {vaccinated: true }},
...     false, true);
> db.unicorns.find({vaccinated: true});
{ "_id" : ObjectId("52632e567023ef178f1b6647"), "dob" : ISODate("1979-08-18T22:44:00Z"), "gender" : "m", "loves" : [  "apple" ], "name" : "Roooooodles", "vaccinated" : true, "vampires" : 99, "weight" : 590 }
{ "_id" : ObjectId("52632e567023ef178f1b6644"), "dob" : ISODate("1992-03-13T12:47:00Z"), "gender" : "m", "loves" : [  "carrot",  "papaya" ], "name" : "Horny", "vaccinated" : true, "vampires" : 63, "weight" : 600 }
{ "_id" : ObjectId("52632e567023ef178f1b6646"), "dob" : ISODate("1973-02-10T03:10:00Z"), "gender" : "m", "loves" : [  "energon",  "redbull" ], "name" : "Unicrom", "vaccinated" : true, "vampires" : 182, "weight" : 984 }
{ "_id" : ObjectId("52632e567023ef178f1b6648"), "dob" : ISODate("1985-07-04T06:01:00Z"), "gender" : "f", "loves" : [  "apple",  "carrot",  "chocolate" ], "name" : "Solnara", "vaccinated" : true, "vampires" : 80, "weight" : 550 }
{ "_id" : ObjectId("52632e567023ef178f1b6649"), "dob" : ISODate("1998-03-07T13:30:00Z"), "gender" : "f", "loves" : [  "strawberry",  "lemon" ], "name" : "Ayna", "vaccinated" : true, "vampires" : 40, "weight" : 733 }
{ "_id" : ObjectId("52632e567023ef178f1b664a"), "dob" : ISODate("1997-07-01T14:42:00Z"), "gender" : "m", "loves" : [  "grape",  "lemon" ], "name" : "Kenny", "vaccinated" : true, "vampires" : 39, "weight" : 690 }
{ "_id" : ObjectId("52632e567023ef178f1b664b"), "dob" : ISODate("2005-05-03T04:57:00Z"), "gender" : "m", "loves" : [  "apple",  "sugar" ], "name" : "Raleigh", "vaccinated" : true, "vampires" : 2, "weight" : 421 }
{ "_id" : ObjectId("52632e567023ef178f1b664c"), "dob" : ISODate("2001-10-08T18:53:00Z"), "gender" : "f", "loves" : [  "apple",  "watermelon" ], "name" : "Leia", "vaccinated" : true, "vampires" : 33, "weight" : 601 }
{ "_id" : ObjectId("52632e567023ef178f1b664d"), "dob" : ISODate("1997-03-01T10:03:00Z"), "gender" : "m", "loves" : [  "apple",  "watermelon" ], "name" : "Pilot", "vaccinated" : true, "vampires" : 52, "weight" : 650 }
{ "_id" : ObjectId("52632e567023ef178f1b664e"), "dob" : ISODate("1999-12-20T21:15:00Z"), "gender" : "f", "loves" : [  "grape",  "carrot" ], "name" : "Nimue", "vaccinated" : true, "weight" : 540 }
{ "_id" : ObjectId("52632e577023ef178f1b664f"), "dob" : ISODate("1976-07-18T22:18:00Z"), "gender" : "m", "loves" : [  "grape",  "watermelon" ], "name" : "Dunx", "vaccinated" : true, "vampires" : 165, "weight" : 704 }
{ "_id" : ObjectId("52632e567023ef178f1b6645"), "dob" : ISODate("1991-01-24T18:00:00Z"), "gender" : "f", "loves" : [  "carrot",  "grape",  "sugar" ], "name" : "Aurora", "vaccinated" : true, "vampires" : 43, "weight" : 450 }
>
>
>
>


===Chapter-3===

>
>
>
>
> db.unicorns.find(null, {name: 1});
{ "_id" : ObjectId("52632e567023ef178f1b6647"), "name" : "Roooooodles" }
{ "_id" : ObjectId("52632e567023ef178f1b6644"), "name" : "Horny" }
{ "_id" : ObjectId("52632e567023ef178f1b6646"), "name" : "Unicrom" }
{ "_id" : ObjectId("52632e567023ef178f1b6648"), "name" : "Solnara" }
{ "_id" : ObjectId("52632e567023ef178f1b6649"), "name" : "Ayna" }
{ "_id" : ObjectId("52632e567023ef178f1b664a"), "name" : "Kenny" }
{ "_id" : ObjectId("52632e567023ef178f1b664b"), "name" : "Raleigh" }
{ "_id" : ObjectId("52632e567023ef178f1b664c"), "name" : "Leia" }
{ "_id" : ObjectId("52632e567023ef178f1b664d"), "name" : "Pilot" }
{ "_id" : ObjectId("52632e567023ef178f1b664e"), "name" : "Nimue" }
{ "_id" : ObjectId("52632e577023ef178f1b664f"), "name" : "Dunx" }
{ "_id" : ObjectId("52632e567023ef178f1b6645"), "name" : "Aurora" }
>
>
>
> //heaviest unicorns first
> db.unicorns.find().sort({weight: -1})
{ "_id" : ObjectId("52632e567023ef178f1b6646"), "dob" : ISODate("1973-02-10T03:10:00Z"), "gender" : "m", "loves" : [  "energon",  "redbull" ], "name" : "Unicrom", "vaccinated" : true, "vampires" : 182, "weight" : 984 }
{ "_id" : ObjectId("52632e567023ef178f1b6649"), "dob" : ISODate("1998-03-07T13:30:00Z"), "gender" : "f", "loves" : [  "strawberry",  "lemon" ], "name" : "Ayna", "vaccinated" : true, "vampires" : 40, "weight" : 733 }
{ "_id" : ObjectId("52632e577023ef178f1b664f"), "dob" : ISODate("1976-07-18T22:18:00Z"), "gender" : "m", "loves" : [  "grape",  "watermelon" ], "name" : "Dunx", "vaccinated" : true, "vampires" : 165, "weight" : 704 }
{ "_id" : ObjectId("52632e567023ef178f1b664a"), "dob" : ISODate("1997-07-01T14:42:00Z"), "gender" : "m", "loves" : [  "grape",  "lemon" ], "name" : "Kenny", "vaccinated" : true, "vampires" : 39, "weight" : 690 }
{ "_id" : ObjectId("52632e567023ef178f1b664d"), "dob" : ISODate("1997-03-01T10:03:00Z"), "gender" : "m", "loves" : [  "apple",  "watermelon" ], "name" : "Pilot", "vaccinated" : true, "vampires" : 52, "weight" : 650 }
{ "_id" : ObjectId("52632e567023ef178f1b664c"), "dob" : ISODate("2001-10-08T18:53:00Z"), "gender" : "f", "loves" : [  "apple",  "watermelon" ], "name" : "Leia", "vaccinated" : true, "vampires" : 33, "weight" : 601 }
{ "_id" : ObjectId("52632e567023ef178f1b6644"), "dob" : ISODate("1992-03-13T12:47:00Z"), "gender" : "m", "loves" : [  "carrot",  "papaya" ], "name" : "Horny", "vaccinated" : true, "vampires" : 63, "weight" : 600 }
{ "_id" : ObjectId("52632e567023ef178f1b6647"), "dob" : ISODate("1979-08-18T22:44:00Z"), "gender" : "m", "loves" : [  "apple" ], "name" : "Roooooodles", "vaccinated" : true, "vampires" : 99, "weight" : 590 }
{ "_id" : ObjectId("52632e567023ef178f1b6648"), "dob" : ISODate("1985-07-04T06:01:00Z"), "gender" : "f", "loves" : [  "apple",  "carrot",  "chocolate" ], "name" : "Solnara", "vaccinated" : true, "vampires" : 80, "weight" : 550 }
{ "_id" : ObjectId("52632e567023ef178f1b664e"), "dob" : ISODate("1999-12-20T21:15:00Z"), "gender" : "f", "loves" : [  "grape",  "carrot" ], "name" : "Nimue", "vaccinated" : true, "weight" : 540 }
{ "_id" : ObjectId("52632e567023ef178f1b6645"), "dob" : ISODate("1991-01-24T18:00:00Z"), "gender" : "f", "loves" : [  "carrot",  "grape",  "sugar" ], "name" : "Aurora", "vaccinated" : true, "vampires" : 43, "weight" : 450 }
{ "_id" : ObjectId("52632e567023ef178f1b664b"), "dob" : ISODate("2005-05-03T04:57:00Z"), "gender" : "m", "loves" : [  "apple",  "sugar" ], "name" : "Raleigh", "vaccinated" : true, "vampires" : 2, "weight" : 421 }
>
> //by unicorn name then vampire kills:
> db.unicorns.find().sort({name: 1,
...     vampires: -1})
{ "_id" : ObjectId("52632e567023ef178f1b6645"), "dob" : ISODate("1991-01-24T18:00:00Z"), "gender" : "f", "loves" : [  "carrot",  "grape",  "sugar" ], "name" : "Aurora", "vaccinated" : true, "vampires" : 43, "weight" : 450 }
{ "_id" : ObjectId("52632e567023ef178f1b6649"), "dob" : ISODate("1998-03-07T13:30:00Z"), "gender" : "f", "loves" : [  "strawberry",  "lemon" ], "name" : "Ayna", "vaccinated" : true, "vampires" : 40, "weight" : 733 }
{ "_id" : ObjectId("52632e577023ef178f1b664f"), "dob" : ISODate("1976-07-18T22:18:00Z"), "gender" : "m", "loves" : [  "grape",  "watermelon" ], "name" : "Dunx", "vaccinated" : true, "vampires" : 165, "weight" : 704 }
{ "_id" : ObjectId("52632e567023ef178f1b6644"), "dob" : ISODate("1992-03-13T12:47:00Z"), "gender" : "m", "loves" : [  "carrot",  "papaya" ], "name" : "Horny", "vaccinated" : true, "vampires" : 63, "weight" : 600 }
{ "_id" : ObjectId("52632e567023ef178f1b664a"), "dob" : ISODate("1997-07-01T14:42:00Z"), "gender" : "m", "loves" : [  "grape",  "lemon" ], "name" : "Kenny", "vaccinated" : true, "vampires" : 39, "weight" : 690 }
{ "_id" : ObjectId("52632e567023ef178f1b664c"), "dob" : ISODate("2001-10-08T18:53:00Z"), "gender" : "f", "loves" : [  "apple",  "watermelon" ], "name" : "Leia", "vaccinated" : true, "vampires" : 33, "weight" : 601 }
{ "_id" : ObjectId("52632e567023ef178f1b664e"), "dob" : ISODate("1999-12-20T21:15:00Z"), "gender" : "f", "loves" : [  "grape",  "carrot" ], "name" : "Nimue", "vaccinated" : true, "weight" : 540 }
{ "_id" : ObjectId("52632e567023ef178f1b664d"), "dob" : ISODate("1997-03-01T10:03:00Z"), "gender" : "m", "loves" : [  "apple",  "watermelon" ], "name" : "Pilot", "vaccinated" : true, "vampires" : 52, "weight" : 650 }
{ "_id" : ObjectId("52632e567023ef178f1b664b"), "dob" : ISODate("2005-05-03T04:57:00Z"), "gender" : "m", "loves" : [  "apple",  "sugar" ], "name" : "Raleigh", "vaccinated" : true, "vampires" : 2, "weight" : 421 }
{ "_id" : ObjectId("52632e567023ef178f1b6647"), "dob" : ISODate("1979-08-18T22:44:00Z"), "gender" : "m", "loves" : [  "apple" ], "name" : "Roooooodles", "vaccinated" : true, "vampires" : 99, "weight" : 590 }
{ "_id" : ObjectId("52632e567023ef178f1b6648"), "dob" : ISODate("1985-07-04T06:01:00Z"), "gender" : "f", "loves" : [  "apple",  "carrot",  "chocolate" ], "name" : "Solnara", "vaccinated" : true, "vampires" : 80, "weight" : 550 }
{ "_id" : ObjectId("52632e567023ef178f1b6646"), "dob" : ISODate("1973-02-10T03:10:00Z"), "gender" : "m", "loves" : [  "energon",  "redbull" ], "name" : "Unicrom", "vaccinated" : true, "vampires" : 182, "weight" : 984 }
>
>
>
> db.unicorns.find()
{ "_id" : ObjectId("52632e567023ef178f1b6647"), "dob" : ISODate("1979-08-18T22:44:00Z"), "gender" : "m", "loves" : [  "apple" ], "name" : "Roooooodles", "vaccinated" : true, "vampires" : 99, "weight" : 590 }
{ "_id" : ObjectId("52632e567023ef178f1b6644"), "dob" : ISODate("1992-03-13T12:47:00Z"), "gender" : "m", "loves" : [  "carrot",  "papaya" ], "name" : "Horny", "vaccinated" : true, "vampires" : 63, "weight" : 600 }
{ "_id" : ObjectId("52632e567023ef178f1b6646"), "dob" : ISODate("1973-02-10T03:10:00Z"), "gender" : "m", "loves" : [  "energon",  "redbull" ], "name" : "Unicrom", "vaccinated" : true, "vampires" : 182, "weight" : 984 }
{ "_id" : ObjectId("52632e567023ef178f1b6648"), "dob" : ISODate("1985-07-04T06:01:00Z"), "gender" : "f", "loves" : [  "apple",  "carrot",  "chocolate" ], "name" : "Solnara", "vaccinated" : true, "vampires" : 80, "weight" : 550 }
{ "_id" : ObjectId("52632e567023ef178f1b6649"), "dob" : ISODate("1998-03-07T13:30:00Z"), "gender" : "f", "loves" : [  "strawberry",  "lemon" ], "name" : "Ayna", "vaccinated" : true, "vampires" : 40, "weight" : 733 }
{ "_id" : ObjectId("52632e567023ef178f1b664a"), "dob" : ISODate("1997-07-01T14:42:00Z"), "gender" : "m", "loves" : [  "grape",  "lemon" ], "name" : "Kenny", "vaccinated" : true, "vampires" : 39, "weight" : 690 }
{ "_id" : ObjectId("52632e567023ef178f1b664b"), "dob" : ISODate("2005-05-03T04:57:00Z"), "gender" : "m", "loves" : [  "apple",  "sugar" ], "name" : "Raleigh", "vaccinated" : true, "vampires" : 2, "weight" : 421 }
{ "_id" : ObjectId("52632e567023ef178f1b664c"), "dob" : ISODate("2001-10-08T18:53:00Z"), "gender" : "f", "loves" : [  "apple",  "watermelon" ], "name" : "Leia", "vaccinated" : true, "vampires" : 33, "weight" : 601 }
{ "_id" : ObjectId("52632e567023ef178f1b664d"), "dob" : ISODate("1997-03-01T10:03:00Z"), "gender" : "m", "loves" : [  "apple",  "watermelon" ], "name" : "Pilot", "vaccinated" : true, "vampires" : 52, "weight" : 650 }
{ "_id" : ObjectId("52632e567023ef178f1b664e"), "dob" : ISODate("1999-12-20T21:15:00Z"), "gender" : "f", "loves" : [  "grape",  "carrot" ], "name" : "Nimue", "vaccinated" : true, "weight" : 540 }
{ "_id" : ObjectId("52632e577023ef178f1b664f"), "dob" : ISODate("1976-07-18T22:18:00Z"), "gender" : "m", "loves" : [  "grape",  "watermelon" ], "name" : "Dunx", "vaccinated" : true, "vampires" : 165, "weight" : 704 }
{ "_id" : ObjectId("52632e567023ef178f1b6645"), "dob" : ISODate("1991-01-24T18:00:00Z"), "gender" : "f", "loves" : [  "carrot",  "grape",  "sugar" ], "name" : "Aurora", "vaccinated" : true, "vampires" : 43, "weight" : 450 }
>     .sort({weight: -1})
Sat Oct 19 21:23:49.244 SyntaxError: Unexpected token .
>     .limit(2)
Sat Oct 19 21:23:49.246 SyntaxError: Unexpected token .
>     .skip(1)
Sat Oct 19 21:23:51.301 SyntaxError: Unexpected token .
>
>
> db.unicorns.find().sort({weight: -1}).limit(2).skip(1)
{ "_id" : ObjectId("52632e567023ef178f1b6649"), "dob" : ISODate("1998-03-07T13:30:00Z"), "gender" : "f", "loves" : [  "strawberry",  "lemon" ], "name" : "Ayna", "vaccinated" : true, "vampires" : 40, "weight" : 733 }
{ "_id" : ObjectId("52632e577023ef178f1b664f"), "dob" : ISODate("1976-07-18T22:18:00Z"), "gender" : "m", "loves" : [  "grape",  "watermelon" ], "name" : "Dunx", "vaccinated" : true, "vampires" : 165, "weight" : 704 }
>
>
>
>
>
> db.unicorns.count({vampires: {$gt: 50}})
6
>
> db.unicorns.find({vampires: {$gt: 50}}).count()
6
>
>
>


===Chapter-4===


>
> db.employees.insert({_id: ObjectId(
...     "4d85c7039ab0fd70a117d730"),
...     name: 'Leto'})
>
>
>
>
>
> db.employees.insert({_id: ObjectId(
...     "4d85c7039ab0fd70a117d731"),
...     name: 'Duncan',
...     manager: ObjectId(
...     "4d85c7039ab0fd70a117d730")});
> db.employees.insert({_id: ObjectId(
...     "4d85c7039ab0fd70a117d732"),
...     name: 'Moneo',
...     manager: ObjectId(
...     "4d85c7039ab0fd70a117d730")});
>
>
> db.employees.find({manager: ObjectId(
...     "4d85c7039ab0fd70a117d730")})
{ "_id" : ObjectId("4d85c7039ab0fd70a117d731"), "name" : "Duncan", "manager" : ObjectId("4d85c7039ab0fd70a117d730") }
{ "_id" : ObjectId("4d85c7039ab0fd70a117d732"), "name" : "Moneo", "manager" : ObjectId("4d85c7039ab0fd70a117d730") }
>
>
>
> db.employees.insert({_id: ObjectId(
...     "4d85c7039ab0fd70a117d733"),
...     name: 'Siona',
...     manager: [ObjectId(
...     "4d85c7039ab0fd70a117d730"),
...     ObjectId(
...     "4d85c7039ab0fd70a117d732")] })
>
>
>
> db.employees.find({manager: ObjectId(
...     "4d85c7039ab0fd70a117d730")})
{ "_id" : ObjectId("4d85c7039ab0fd70a117d731"), "name" : "Duncan", "manager" : ObjectId("4d85c7039ab0fd70a117d730") }
{ "_id" : ObjectId("4d85c7039ab0fd70a117d732"), "name" : "Moneo", "manager" : ObjectId("4d85c7039ab0fd70a117d730") }
{ "_id" : ObjectId("4d85c7039ab0fd70a117d733"), "name" : "Siona", "manager" : [ ObjectId("4d85c7039ab0fd70a117d730"),      ObjectId("4d85c7039ab0fd70a117d732") ] }
>
>
>
>
> db.employees.insert({_id: ObjectId(
...     "4d85c7039ab0fd70a117d734"),
...     name: 'Ghanima',
...     family: {mother: 'Chani',
...         father: 'Paul',
...         brother: ObjectId(
...     "4d85c7039ab0fd70a117d730")}})
>
>
>
> db.employees.find({
...     'family.mother': 'Chani'})
{ "_id" : ObjectId("4d85c7039ab0fd70a117d734"), "name" : "Ghanima", "family" : { "mother" : "Chani", "father" : "Paul", "brother" : ObjectId("4d85c7039ab0fd70a117d730") } }
>
>
>
> db.users.insert({name: 'leto',
...     email: 'leto@dune.gov',
...     account: {allowed_gholas: 5,
...     spice_ration: 10}})
>
>
>
>