//NoSQL
user1: FirstName, LastName
user2: LastName, Age
 
//SQL
FirstName, LastName, Age
user1: Maria, Oussadi, NULL
user2: NULL, Casablancas, 44

mongosh //Start the MongoDB server
 
mongo  //Open MongoDBs Shell
 
show dbs  //Show the list of DBs
 
use dbname //Use or Create new DB
 
show collections  //Show collections
 
db.help  //Get methods
 
db.collectionName.insertOne({    //Insert into or create
	//parameters
})
 
db.collectionName.find({    //Find data
	//parameters
})
 

db.collectionName.updateOne({    // Update data (one update)
	//search parameters
},
	 {"$set: {.. parameters to update}"}
 
 
db.User.updateMany({query},{$set: {parameters}})   //Many Updates
 
 
db.User.deleteOne({firstame: "abd"}) // Delete one document, or use deleteMany to delete many data
 
 
db.User.drop()   //drop all data
 
 
exit  //to exit the shell

npm i mongoose  // install it from npm

const mongoose = require('mongoose')  // we require it 

mongoose.connect('mongodb://localhost:27017/DBName'); //put the link of the db

const URI= 'mongodb://localhost:27017/Demo'
mongoose.connect(URI)
	.then((connection) => {
		console.log("db connected");
	})
	.catch((reason) => {
		console.error(reason);
		process.exit(-1);
	});

mongoose.connect(URI,{ useNewUrlParser: true });

const mongoose =require( 'mongoose');
const { Schema } = mongoose;
 
const userSchema = new Schema({
	first_name:  String, 
	last_name: String,
	age: Number
	});

const userModel=mongoose.model("User",userSchema);

async function createData(first_name,last_name,age){
	try{
		const user = await userModel.create({first_name,last_name,age});
		return user;
		}catch(e){
			return null;
			}
	}