Common operators used for updates:
• $set: sets a field's value, or adds it if it doesn't exist
• $inc: increases or decreases a number field's value
• $unset: removes a field
• $push: adds a new item into an array field
javascript
// Increment the quantity of "journal" by 5
db.inventory.updateOne(
{ item: "journal" },
{ $inc: { qty: 5 } }
)You should see
(The qty for "journal" will go from 25 up to 30)