Mongodb Commands for Beginners

reference

capped collection -> limiting the number of documents

Show all rows in the collection db.<name_of_collection>.find()
Find first row matching the object db.<name_of_collection>.find({name: "Chaitanya"})
Show all rows in the collection (prettified) db.<name_of_collection>.find().pretty()
Search for rows db.<name_of_collection>.find({lang: 'Python'})
Limit find results db.<name_of_collection>.find().limit(2)
Insert one Row db.<name_of_collection>.insert({ 'name': 'Chaitanya', 'lang': 'JavaScript', 'member_since': 2018 })
Insert many Rows `db.<name_of_collection>.insertMany([ { ’name’: ‘Chaitanya’, ’lang’: ‘JavaScript’, ‘member_since’: 2018 }, { ’name’: ‘Shahare’, ’lang’: ‘Python’, ‘member_since’: 2018 }, { ’name’: ‘Chaitanya’, ’lang’: ‘JavaScript’, ‘member_since’: 2018 },
])`
Delete Row db.<name_of_collection>.remove({name: "shahare"})
Count the number of rows in the output db.<name_of_collection>.find().count()
Sorting db.<name_of_collection>.find().sort({member_since: -1}).pretty()
Update a rows db.<name_of_collection>.update({name: 'Chaitanya'}, { 'name': 'Chaitanya', 'lang': 'C++', 'member_since': 2009 })
If you want to make a new object, if no matches are found, add a option db.<name_of_collection>.update({name: 'Chaitanya'}, { 'name': 'Chaitanya', 'lang': 'C++', 'member_since': 2009 }, {upsert: true})

Increment update operator $inc db.<name_of_collection>.update({name: 'shahare'}, {$inc: { member_since: 2 }})
Rename update operator $rename db.<name_of_collection>.update({name: 'shahare'}, {$rename: { member_since: 2 }})

Less than $lt db.<name_of_collection>.find({ member_since: {$lt: 90} })
Less than equal to $lte db.<name_of_collection>.find({ member_since: {$lte: 90} })
Greater than $gt db.<name_of_collection>.find({ member_since: {$gt: 90} })
Greater than equal to $gte db.<name_of_collection>.find({ member_since: {$gte: 90} })