Step 1: Switch to the Database

Before querying data, ensure you are using the correct database.

use myDatabase

Step 2: Retrieve All Documents

To fetch all documents from a collection, use find().

db.users.find()

For a more readable output:

db.users.find().pretty()

Step 3: Retrieve Documents with a Condition

To find documents that match a specific condition, pass a query inside find().

db.users.find({ age: 30 })

Step 4: Retrieve a Single Document

If you only need one document, use findOne().

db.users.findOne({ city: "New York" })

Step 5: Retrieve Specific Fields

You can control which fields to display by passing a second argument to find().

db.users.find({}, { name: 1, city: 1, _id: 0 })

Step 6: Use Comparison Operators

MongoDB allows advanced queries using comparison operators like $gt, $lt, $eq, etc.

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

Step 7: Sort the Data

To sort results in ascending (1) or descending (-1) order, use sort().

db.users.find().sort({ age: 1 })  # Ascending
db.users.find().sort({ age: -1 }) # Descending

Step 8: Limit and Skip Records

• Use limit() to control the number of documents retrieved.
• Use skip() to ignore a specific number of documents.

db.users.find().limit(5)   # Fetches only 5 documents
db.users.find().skip(2)    # Skips the first 2 documents

Conclusion

You’ve now learned how to retrieve data from MongoDB efficiently. Here’s a quick recap:
✅ Use find() to retrieve all documents.
✅ Use findOne() for a single document.
✅ Use filters and comparison operators to refine results.
✅ Use sort(), limit(), and skip() for better control.

Now, start querying data effectively in MongoDB! 🚀