Why SDK integration is essential in DynamoDB - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to initialize the DynamoDB client using the AWS SDK.

DynamoDB

const AWS = require('aws-sdk');
const dynamoDB = new AWS.DynamoDB({ region: [1] });

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

A'database'

B'nodejs'

C'sdk'

D'us-west-2'

Attempts:

3 left

💡 Hint

Common Mistakes

Using a non-region string like 'nodejs' or 'sdk' instead of a valid AWS region.

The region is required to tell the SDK where your DynamoDB service is located.

2fill in blank

medium

Complete the code to put an item into a DynamoDB table using the SDK.

DynamoDB

const params = {
  TableName: 'Users',
  Item: {
    'UserId': { S: '123' },
    'Name': { S: [1] }
  }
};
dynamoDB.putItem(params, (err, data) => { /* callback */ });

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

A'Alice'

B123

Cnull

Dtrue

Attempts:

3 left

💡 Hint

Common Mistakes

Using a number or boolean instead of a string for the 'Name' attribute.

The 'Name' attribute expects a string value wrapped in quotes.

3fill in blank

hard

Fix the error in the code to correctly get an item from DynamoDB using the SDK.

DynamoDB

const params = {
  TableName: 'Users',
  Key: {
    'UserId': { [1]: '123' }
  }
};
dynamoDB.getItem(params, (err, data) => { /* callback */ });

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

AN

BS

CBOOL

DNULL

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'N' for a string key causes errors.

The key attribute type for a string is 'S' in DynamoDB SDK.

4fill in blank

hard

Fill both blanks to update an item attribute using the DynamoDB SDK.

DynamoDB

const params = {
  TableName: 'Users',
  Key: { 'UserId': { [1]: '123' } },
  UpdateExpression: 'set #N = :name',
  ExpressionAttributeNames: { '#N': [2] },
  ExpressionAttributeValues: { ':name': { S: 'Bob' } }
};
dynamoDB.updateItem(params, (err, data) => { /* callback */ });

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

AS

B'Name'

CN

D'Age'

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'N' for UserId key or wrong attribute name in ExpressionAttributeNames.

The key type for UserId is 'S' for string, and the attribute name to update is 'Name'.

5fill in blank

hard

Fill all three blanks to query items from DynamoDB with a condition using the SDK.

DynamoDB

const params = {
  TableName: 'Orders',
  KeyConditionExpression: '#id = :orderId',
  ExpressionAttributeNames: { [1]: 'OrderId' },
  ExpressionAttributeValues: { [2]: { S: 'A123' } },
  ProjectionExpression: [3]
};
dynamoDB.query(params, (err, data) => { /* callback */ });

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

A'#orderId'

B':orderId'

C'OrderId, Amount'

D'#id'

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing up keys and values in ExpressionAttributeNames and ExpressionAttributeValues.

Using wrong attribute names in ProjectionExpression.

ExpressionAttributeNames maps '#id' to 'OrderId', ExpressionAttributeValues uses ':orderId', and ProjectionExpression lists attributes to return.