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Vincent is a Cloud DevOps Engineer with years of hands-on experience supporting, automating, and optimizing mission-critical deployments in Azure and AWS, leveraging configuration management, CI/CD, and DevOps processes. Strong background in Technical Operations and customer relations.
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Let's talk about MongoDB - The database for modern applications
MongoDB is a general-purpose, document-based, distributed database built for modern application developers and the cloud era. No database makes you more productive.
These Links provide instructions to install MongoDB Community Edition for supported Linux systems.
These Links provide instructions to install MongoDB Community Edition for macOS systems.
These Links provide instructions to install MongoDB Community Edition for Windows systems.
Open your terminal, command prompt, power shell or bash. Whichever you have installed on your system and let's get started
To start the MongoDB shell,
mongo
Will create a database named amazon and switch to it
use amazon
Will show you the current database you're in
db
Will display all databases you have
show dbs
Will create a collection called products with documents name and macbook value in the amazon database
db.products.insert({name: "macbook"})
Will create a collection of users
db.createCollection("users")
Will show a list of collections in your database
show collections
Will delete the collection users from the database
db.users.drop()
Will delete the entire database you are currently on
db.dropDatabase()
Creates a collection products and inserts one document into it
db.products.insertOne({name: "macbook", price: 1500, category: "Computers"})
Will help us find all the documents in the products collection
db.products.find()
Will creates many documents into the product collection
db.products.insertMany([{name: "iPhone 11", price: 1900, category: " Electronics"}, {name: "Headphone", price: 120, category: "Electronics" }])
The find() helps us find every document in a collection e.g in products below
db.products.find()
Returns the collection results in JSON format
db.products.find().pretty()
Finds a specific item passed in, if it exists
db.products.find({name: "macbook"})
Finds a specific key only
db.products.find({}, {name: 1})
Finds a specific key only and hide the _id
db.products.find({}, {name: 1, _id: 0})
Finds a specific key only, hide the _id and show only the first 2
db.products.find({}, {name: 1, _id:0}).limit(2)
Finds every item that is less than 150
db.products.find({price : {$lt: 150} })
Finds every item that is less than or equal to 150
db.products.find({price : {$lte: 150} })
Finds every item that is grater than 800
db.products.find({price : {$gt: 800} })
Finds every item that is grater than or equal to 800
db.products.find({price : {$gte: 800} })
Finds every item that its price is less than 200 and belongs to the category of Electronics
db.products.find({$and: [{price: {$lt:200}}, {category: "Electronics"} ]})
Finds every item that its price is greater than 500 or belongs to the category of Electronics
db.products.find({$or: [{price: {$gt:500}}, {category: "Electronics"} ]})
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