Full-Stack Web Development with Vue.js and Node

Introducing MongoDB Chapter 3

This removes the entry of a user whose name is John. The output is as follows:

As you can see in the output, the deletedCount is 1 , which means the record has been

deleted.

deleteMany()

The command for deleteMany() is the same as deleteOne(). The only difference is

that deleteOne() removes only a single entry with the matched filter whereas

deleteMany() removes all the documents which match the given criteria:

> db.users.deleteMany( { name: "Jack" } )

The output is as follows:

remove()

The remove() command works to remove a single entry, as well as multiple entries, from a

collection. If we want to remove only a single document that matched certain criteria, then

we can pass the count of entries that we wish to delete. For example, let's first create an

entry:

> db.users.insertOne({ name: 'Mike', email: '[email protected]' })

With this, now we have two entries for Mike. Now, if we want to remove just one entry

using remove(), we can do so with:

> db.users.remove({ name: 'Mike' }, 1)