MongoDB Cheat Sheet

mongodb-cheat-sheet.md

1. Insert a single document

db.products.insertOne({ name: 'Product 1', price: 200 })

2. Insert multiple documents - Ordered

db.products.insertMany([{ name: 'Product 1', price: 200 }, { name: 'Product 2', price: 100 }])

3. Insert multiple documents - Unordered

db.products.insertMany([{ name: 'Product 1', price: 200 }, { name: 'Product 2', price: 100 }], {ordered: false})

4. Select all documents in a collection

db.products.find()

5. Beautify returned collection

db.products.find().pretty()

6. Find all documents that satisfies the specified query criteria

db.products.find({ status : 1})

7. Find first document that satisfies the specified query criteria

db.products.findOne({ status : 1})

8. Find the first document in the collection

db.products.findOne({})

9. Returns the number of documents that match a query

db.products.count()

db.products.find({price : { $gt : 100} }).count()

db.products.countDocuments()

10. Updates a single document based on the filter

db.products.updateOne({name : 'Product 1'}, {$set : {price : 210}})

11. Updates all documents that match the specified filter

db.products.updateMany({quantity : 0}, {$set : {status : 0}})

12. Replace an entire document

db.products.updateOne({name : 'Product 1'}, { name: 'Product 11', price: 300, status: 0 })

13. Removes a single document from a collection.

db.products.deleteOne({name : 'Product 1'})

14. Removes all documents that match the filter.

db.products.deleteMany({price : {$gte : 100}})

15. Removes all documents in a collection

db.products.deleteMany({})

16. Deletes a single document based on the filter and returning the deleted document.

db.products.findOneAndDelete({name : 'Product 1'})

17. Sort the documents - Ascending Order

db.products.find().sort({ price : 1 })

18. Sort the documents - Descending Order

db.products.find().sort({ price : -1 })

19. Limit the numbers of documents returned

db.products.find().limit(5)

20. Increments the value of the field by the specified amount

db.products.updateOne({title: 'Product 1'}, {$inc : {quantity : 1} })

21. Decrement the value of the field by the specified amount

db.products.updateOne({title: 'Product 1'}, {$inc : {quantity : -1} })

22. Add an item to an array

db.products.updateOne({ _id: 1 }, { $push: { sizes: 'small' } })

23. Remove the first item from an array

db.products.updateOne({ _id: 1 }, { $pop: { sizes: -1 } })

24. Remove the last item from an array

db.products.updateOne({ _id: 1 }, { $pop: { sizes: 1 } })

25. Add multiple items to an array

db.products.updateOne({ _id: 1 }, { $push: { sizes: { $each : ['small', 'large', 'medium'] }} })

26. Add an item to an array unless the item is already present

db.products.updateOne({ _id: 1 }, { $addToSet: { sizes: 'large'} })

27. Sets the value of a field to the current date

db.products.updateOne({ _id: 1 }, { $currentDate: { lastModified : true } })

28. Update the field if the specified value is less than the current value of the field

db.products.updateOne({ _id: 1 }, { $min : { price : 150 }})

29. Update the field if the specified value is greater than the current value of the field

db.products.updateOne({ _id: 1 }, { $max : { price : 250 }})

30. Multiply the value of a field by a number

db.products.updateOne({ _id: 1 }, { $mul : { quantity : 2 }})

31. Rename a field

db.products.updateOne({ _id: 1 }, { $rename : { quantity : 'qty' }})

32. Deletes a particular field

db.products.updateOne({ _id: 1 }, { $unset : { quantity : "" }})