SQL vs NoSQL

• SQL are Relational Databases whereas, NoSQL are non-relational or distributed database. Popular SQL databases
• MySQL
• PostgreSQL
• SQLite

Popular NoSQL Databases

• MongoDB
• Redis
• Amazon DynamoDB

MongoDB

• A popular NoSQL database
• Datas are stored in the form of key-value pair.

Inserting :

• In mongoDB, objects are stored in a collection, To create a collection: db.createCollection("cats")

  • This will create a collection named 'cats'

• To insert datas(objects) into the mongoDB collection, 2 methods can be used

    1. `db.insertOne({document})`
    2. `db.insertMany({documents})`
  

  • Examples:

db.insertOne({
	name : "siamese",
	gender : "female",
	age : 3
	})

db.insertMany([
{
name : "Persian",
gender : "male",
age : 2
},
{
name : "Russian",
gender : "male",
age : 8
}]
	)

Finding :

• In mongoDB, objects inside the collections can be accessed by using the find() method.
• To find everything in the collection, db.cats.find() -> This results in every documents present in the collection named cats.