https://github.com/nageshjagtap/mongodb-interview-question
This repository contains MongoDB practical exercises covering basic to advanced topics. It includes CRUD operations, query operators, and data modeling techniques using embedded documents, references, and joins. Ideal for students and developers learning MongoDB.
https://github.com/nageshjagtap/mongodb-interview-question
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This repository contains MongoDB practical exercises covering basic to advanced topics. It includes CRUD operations, query operators, and data modeling techniques using embedded documents, references, and joins. Ideal for students and developers learning MongoDB.
- Host: GitHub
- URL: https://github.com/nageshjagtap/mongodb-interview-question
- Owner: NAGESHJAGTAP
- Created: 2025-04-12T21:02:36.000Z (12 months ago)
- Default Branch: main
- Last Pushed: 2025-04-16T17:05:23.000Z (11 months ago)
- Last Synced: 2025-05-04T14:12:48.764Z (11 months ago)
- Topics: mongodb, postman
- Homepage:
- Size: 9.77 KB
- Stars: 0
- Watchers: 1
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
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README
---
# 📚 MongoDB-interview-Question: CRUD Operations, Queries & Data Modeling
This repository is designed to help **beginners to intermediate-level developers** learn and practice **MongoDB** through real-world examples and structured questions. MongoDB is a popular NoSQL database known for its flexibility, performance, and scalability. Understanding its features is essential for modern full-stack and backend development.
In this project, you will find:
- ✍️ Hands-on **MongoDB Shell commands** for learning how to manage databases and collections.
- 🔍 Practical examples of **query operators** including `$and`, `$or`, `$in`, `$gt`, `$lte`, and many more.
- ⚙️ A clear breakdown of **CRUD operations** – how to Create, Read, Update, and Delete documents in MongoDB.
- 🧠 Use of **projection** to retrieve only the fields you need.
- 🔢 **Counting**, **sorting**, **limiting**, and **skipping** documents to better control query results.
- 🛠️ Examples of **advanced update operations** using `$inc`, `$set`, `$unset`, etc.
- 🧹 How to **delete** documents, drop collections, and even entire databases.
- 🏗️ **Data modeling** examples to understand **one-to-many** and **many-to-many** relationships.
- 🔗 Explanation of when to use **embedded documents** vs **references**, and how to connect collections using `$lookup`.
---
## 🧾 What You’ll Learn From This Repository
### ✅ Section A: Basic MongoDB Operations
- How to **create databases and collections**
- How to **insert single and multiple documents**
- How to **query documents** using:
- Exact match
- Comparison operators (`$gt`, `$lt`, `$gte`, `$lte`)
- Logical operators (`$and`, `$or`, `$not`)
- Set operators (`$in`, `$nin`)
- How to **display selected fields** using projection
- How to **sort, limit, and skip** records
- How to **count** documents
- How to **update** one or many documents using `$set`, `$inc`, `$unset`
- How to **delete** documents
- How to **drop collections** and **databases**
- How to **list all collections** in a database
### 🧱 Section B: Data Modeling and Relationships
- How to design **one-to-many relationships** using:
- Embedded documents
- Referencing documents
- How to build **many-to-many relationships** with referencing
- When to **embed** vs when to **reference** with clear use cases
- How to use **aggregation and `$lookup`** for performing joins like in SQL
---
## 📌 Why This is Useful
MongoDB is used in many modern stacks such as the **MERN stack (MongoDB, Express, React, Node.js)**. Understanding its core operations and data modeling techniques is important for:
- 📦 Backend development
- 🌐 Full-stack applications
- 📊 Data-heavy applications
- 🚀 Scalable microservices and APIs
This repo is great for:
- 🧑🎓 Students learning NoSQL databases
- 🧑💻 Developers preparing for MongoDB interviews
- 🏗️ Projects using MongoDB for real-world apps
- 📚 Revision and practice before exams
---
## 🧠 Prerequisites
Before using this repository, it helps to have:
- Basic knowledge of JavaScript and Node.js
- MongoDB installed locally or access to [MongoDB Atlas](https://www.mongodb.com/cloud/atlas)
- Familiarity with command line or using **MongoDB Compass** GUI
---
## 🧰 Tools & Technologies Used
- MongoDB
- Mongo Shell or MongoDB Compass
- JavaScript (for some queries)
- Optional: Mongoose (for `.populate()` in Node.js projects)
---
## ✅ How to Use
1. Clone this repository:
```bash
git clone https://github.com/NAGESHJAGTAP/MongoDB-interview-Question.git
```
2. Open `README.md` and practice each command in:
- Mongo Shell (`mongosh`)
- MongoDB Compass
- Your own backend project using Node.js + Mongoose
3. You can also copy-paste the queries into a `.js` file to integrate with a Node.js project.
---
## 🙋♂️ Who Created This?
Created by **Nagesh Jagtap** – a passionate full-stack developer and computer science student.
- 🔗 [LinkedIn](https://www.linkedin.com/in/nagesh-jagtap-9bb56031a/)
- 💻 [GitHub](https://github.com/NAGESHJAGTAP)
---
Would you like me to merge this long description directly into a complete `README.md` file for you?