Step Functions with DynamoDB - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to specify the DynamoDB table name in the Step Functions task.

DynamoDB

{
  "Type": "Task",
  "Resource": "arn:aws:states:::dynamodb:putItem",
  "Parameters": {
    "TableName": "[1]",
    "Item": {
      "ID": { "S": "123" },
      "Status": { "S": "Pending" }
    }
  },
  "End": true
}

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

ADynamoDBTable

BTableName

CMyTable

DStepFunctionTable

Attempts:

3 left

💡 Hint

Common Mistakes

Using a placeholder like 'TableName' instead of the actual table name.

Confusing parameter names with values.

The TableName parameter must be set to the actual DynamoDB table name, such as MyTable.

2fill in blank

medium

Complete the code to specify the attribute name for the item key in the DynamoDB putItem task.

DynamoDB

"Item": {
  "[1]": { "S": "123" },
  "Status": { "S": "Pending" }
}

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AItemKey

BKey

CPrimaryKey

DID

Attempts:

3 left

💡 Hint

Common Mistakes

Using generic names like 'Key' instead of the actual attribute name.

Confusing attribute names with parameter names.

The attribute name for the primary key in the item must match the table's key attribute, commonly ID.

3fill in blank

hard

Fix the error in the DynamoDB updateItem parameters by completing the attribute update expression.

DynamoDB

"UpdateExpression": "SET Status = [1]",
"ExpressionAttributeValues": {
  ":newStatus": { "S": "Completed" }
}

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AnewStatus

B:newStatus

C"Completed"

D:Status

Attempts:

3 left

💡 Hint

Common Mistakes

Omitting the colon in the placeholder name.

Using the actual string value instead of a placeholder.

The UpdateExpression must use a placeholder starting with a colon, like :newStatus, to refer to the value in ExpressionAttributeValues.

4fill in blank

hard

Fill both blanks to complete the DynamoDB getItem parameters for retrieving an item by its key.

DynamoDB

"TableName": "[1]",
"Key": {
  "[2]": { "S": "123" }
}

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AMyTable

BStatus

CID

DItemKey

Attempts:

3 left

💡 Hint

Common Mistakes

Using attribute names that do not match the table schema.

Confusing table name with attribute names.

The TableName must be the actual table name, and the Key attribute must match the primary key attribute name, usually ID.

5fill in blank

hard

Fill all three blanks to complete the DynamoDB query parameters filtering items by status.

DynamoDB

"TableName": "[1]",
"KeyConditionExpression": "[2] = :statusVal",
"ExpressionAttributeValues": {
  ":statusVal": { "S": "[3]" }
}

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

AOrdersTable

BStatus

CPending

DOrderID

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing attribute names and table names.

Using incorrect values in the expression attribute values.

The TableName is the DynamoDB table name, the KeyConditionExpression uses the attribute name to filter, and the ExpressionAttributeValues provides the value to match, such as Pending.