Election process concept in MongoDB - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to find all candidates in the election collection.

MongoDB

db.election.[1]()

Drag options to blanks, or click blank then click option'

Ainsert

Bupdate

Cfind

Ddelete

Attempts:

3 left

💡 Hint

Common Mistakes

Using insert() instead of find()

Using update() when you want to read data

The find() method retrieves documents from a collection.

2fill in blank

medium

Complete the code to count how many votes a candidate named 'Alice' has.

MongoDB

db.votes.countDocuments({ candidate: [1] })

Drag options to blanks, or click blank then click option'

A'John'

B'Alice'

C'Eve'

D'Bob'

Attempts:

3 left

💡 Hint

Common Mistakes

Forgetting quotes around the name

Using the wrong candidate name

We count documents where the candidate field equals 'Alice'.

3fill in blank

hard

Fix the error in the query to find votes where the count is greater than 100.

MongoDB

db.votes.find({ count: { [1]: 100 } })

Drag options to blanks, or click blank then click option'

A$gt

B$eq

C$lt

D$ne

Attempts:

3 left

💡 Hint

Common Mistakes

Using $lt (less than) instead of $gt

Using $eq which means equal

The operator $gt means 'greater than'.

4fill in blank

hard

Fill both blanks to update the vote count for candidate 'Bob' to 250.

MongoDB

db.votes.updateOne({ candidate: [1] }, { [2]: { count: 250 } })

Drag options to blanks, or click blank then click option'

A'Bob'

B$set

C$inc

D'Alice'

Attempts:

3 left

💡 Hint

Common Mistakes

Using $inc instead of $set

Using the wrong candidate name

We match candidate 'Bob' and use $set to change the count to 250.

5fill in blank

hard

Fill all three blanks to create a dictionary with candidate names as keys and their vote counts as values, but only for counts greater than 100.

MongoDB

result = { [1]: [2] for doc in db.votes.find({ count: { [3]: 100 } }) }

Drag options to blanks, or click blank then click option'

Adoc.candidate

Bdoc.count

C$gt

Ddoc.name

Attempts:

3 left

💡 Hint

Common Mistakes

Using doc.name instead of doc.candidate

Using $lt instead of $gt

Swapping keys and values

We use doc.candidate as keys, doc.count as values, and filter with $gt for counts greater than 100.