How do you perform CRUD operations in MongoDB?

Short answer: Create: db.collection.insertOne({ name: "Alice", age: 25 }); db.collection.insertMany([{ name: "Bob", age: 30 }, { name: "Charlie", age: 35 }]); Read: db.collection.find({ age: { $gt: 30 } }); db.collection.findOne({ name: "Alice" }); Update: db.collection.updateOne({ name: "Alice" }, { $set: { age: 26 } }); db.collection.updateMany({ age: { $lt: 30 } }, { $set: { status: "young" } }); Delete:…

Explain a bit more

db.collection.deleteOne({ name: "Alice" }); db.collection.deleteMany({ age: { $lt: 30 } });

Example code

Create: db.collection.insertOne({ name: "Alice", age: 25 }); db.collection.insertMany([{ name: "Bob", age: 30 }, { name: "Charlie", age: 35 }]); Read: db.collection.find({ age: { $gt: 30 } }); db.collection.findOne({ name: "Alice" }); Update: db.collection.updateOne({ name: "Alice" }, { $set: { age: 26 } }); db.collection.updateMany({ age: { $lt: 30 } }, { $set: { status: "young" } }); Delete: db.collection.deleteOne({ name: "Alice" }); db.collection.deleteMany({ age: { $lt: 30 } });

Real-world example (ShopNest)

ShopNest’s SQL Server database stores customers, products, and orders. Good indexes and clear foreign keys keep checkout queries fast and safe.

Say this in the interview

1. Define — one clear sentence (the short answer above).
2. Example — relate it to a project like ShopNest or your real work.
3. Trade-off — when you would not use it.