MongoDB Shell (mongosh) basics - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to show all databases in MongoDB shell.

MongoDB

show [1]

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

Adatabases

Bdocs

Ctables

Dcollections

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'show collections' instead of 'show databases'.

Typing 'show tables' which is not a MongoDB command.

The show databases command lists all databases in the MongoDB shell.

2fill in blank

medium

Complete the code to switch to a database named 'school'.

MongoDB

use [1]

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

Aschool

Bstudents

Cadmin

Dtest

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'use students' instead of 'use school'.

Typing 'use admin' which switches to the admin database.

The use command switches the current database. Here, we switch to the 'school' database.

3fill in blank

hard

Fix the error in the command to list collections in the current database.

MongoDB

db.[1]()

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

AshowCollections

Bcollections

ClistCollections

Dshow

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'db.showCollections()' which is not a valid method.

Using 'db.collections()' which does not exist.

The correct method to list collections in the current database is db.getCollectionNames() or db.listCollections().

4fill in blank

hard

Fill both blanks to insert a document with name 'Alice' and age 25 into the 'users' collection.

MongoDB

db.users.[1]([2])

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

AinsertOne

B{ name: 'Alice', age: 25 }

C{ name: 'Bob', age: 30 }

DinsertMany

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'insertMany' when inserting only one document.

Inserting the wrong document data.

Use insertOne to add a single document. The document is an object with name and age fields.

5fill in blank

hard

Fill all three blanks to find all documents in 'products' collection where price is greater than 100.

MongoDB

db.products.[1]([2]: { [3]: 100 })

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

Afind

Bprice

C$gt

DinsertOne

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'insertOne' instead of 'find'.

Using wrong operator like '$lt' instead of '$gt'.

The find method retrieves documents. The query uses price field with $gt operator for 'greater than'.