Create Your First NoSQL Database with MongoDB and Compass | Week 1
Graded Quiz
1. What command would you use to create a database using the MongoDB shell?
db.createDatabase(“<database_name>”)
show <database_name>
use <database_name>
2. Is it possible to store totally different and unrelated documents inside a collection?
No
Yes
3. What does the command
db.posts.update({
{
title: 'Second Post'
},
{
$unset: {
tags: ['hello_world']
}
}
})It adds the string ‘hello_world’ to the array stored inside the tags field of a document with the field title set to ‘Second Post’
It updates the tags field of a document with the title ‘Second Post’ by removing its content and change it to the array [‘hello_world’]
It removes the tags field from a document with title ‘Second Post’
4. What does the command
db.<collection_name>.update({
{},
$set: {
<field_name>: 'string'
}
})Since the filter {} catches all documents in the collection, It will update all documents in the collection and set the <field_name> to ‘string’
It updates one document in the collection and set the <field_name> to ‘string’
5. What are some of the capabilities of MongoDB Compass?
Analyze the contents of a collection
Use the Schema section in order to learn some queries
Show and edit documents in a collection
6. Does a query returning in 0 ms automatically mean that is efficient?
No
Yes
7. What is the purpose of an unique index?
It makes the index created the only one allowed in a collection.
Beside the other advantages of an index, it specifies that we don’t want the index to have any duplicates.
There is no difference compared to a normal index.
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