Learn MQL with Real Code Examples
Updated Nov 18, 2025
Learning Path
Learn MongoDB fundamentals (collections, documents)
Understand MQL queries and operators
Master aggregation pipelines
Learn indexing and performance optimization
Implement real-world projects
Skill Improvement Plan
Week 1: CRUD operations and basic queries
Week 2: Aggregation pipelines and operators
Week 3: Indexing, performance, and schema design
Week 4: Replication, sharding, and production deployment
Interview Questions
What are the differences between find() and aggregate()?
How do you create an index in MongoDB?
Explain $lookup in aggregation
How do you update multiple documents at once?
What is the difference between MQL4 and MQL5?
Cheat Sheet
find(), insertOne(), insertMany(), updateOne(), updateMany(), deleteOne()
Aggregation stages: $match, $group, $project, $sort
Query operators: $eq, $ne, $in, $nin, $gt, $lt
Update operators: $set, $unset, $inc, $push, $pull
Books
MongoDB: The Definitive Guide
Mastering MongoDB Aggregation Framework
MongoDB in Action
Tutorials
MongoDB University Courses
MongoDB Aggregation Framework Tutorial
Official MongoDB CRUD Tutorial
Official Docs
MongoDB Manual
MongoDB Aggregation Docs
MongoDB CRUD Documentation
Community Links
MongoDB Developer Community
StackOverflow MongoDB tag
MongoDB GitHub repos
Community Support
MongoDB official community
StackOverflow MongoDB tag
MongoDB University courses
Active GitHub repositories and forums