Overview

Today's focus: learning the fundamentals of MongoDB. Understood what NoSQL means, how MongoDB stores data, and performed basic CRUD operations using the MongoDB shell or Compass.

What I Learned Today

• What MongoDB is and why it's used • Difference between SQL and NoSQL • Understanding databases, collections, and documents • Insert, Find, Update, Delete operations • Basics of MongoDB Compass or CLI

Key Concepts

MongoDB

• NoSQL document database • Stores data as BSON/JSON objects • Flexible schema (fields can vary)

Database Structure

• Database → Collection → Documents • Document = JSON object • Collection = group of documents

Basic CRUD Operations

Insert

Insert one document:

db.users.insertOne({ name: "John", age: 25 })

Insert multiple documents:

db.users.insertMany([
  { name: "A", age: 20 },
  { name: "B", age: 30 }
])

Find

Find all documents:

db.users.find()

Find with filter:

db.users.find({ age: 25 })