[Solved] In a Step Functions workflow, a Task state calls DynamoDB UpdateItem with this Parameters snippet:{ "TableName": "Orders", "Key": { "OrderId": { "S": "order789" } }, "UpdateExpression":... | DynamoDB

DynamoDB - with Serverless

In a Step Functions workflow, a Task state calls DynamoDB UpdateItem with this Parameters snippet:

{
  "TableName": "Orders",
  "Key": { "OrderId": { "S": "order789" } },
  "UpdateExpression": "SET #st = :newStatus",
  "ExpressionAttributeNames": { "#st": "Status" },
  "ExpressionAttributeValues": { ":newStatus": { "S": "Shipped" } }
}

What will this operation do?

AChange the Status attribute of order789 to 'Shipped'

BDelete the order789 item from the Orders table

CAdd a new item with OrderId 'order789' and Status 'Shipped'

DReturn an error because UpdateExpression is invalid

Step-by-Step Solution

Solution:

Step 1: Understand UpdateItem parameters
UpdateExpression sets the attribute 'Status' to 'Shipped' for the given key.
Step 2: Confirm no syntax errors
ExpressionAttributeNames and Values are correctly defined; syntax is valid.
Final Answer:
Change the Status attribute of order789 to 'Shipped' -> Option A
Quick Check:
UpdateItem with SET changes attribute value [OK]

Quick Trick: UpdateExpression with SET updates attribute value [OK]

Common Mistakes:

MISTAKES

Confusing UpdateItem with DeleteItem
Thinking it adds a new item instead of updating
Misunderstanding ExpressionAttributeNames usage

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More DynamoDB Quizzes

In a Step Functions workflow, a Task state calls DynamoDB UpdateItem with this Parameters snippet:

Step 1: Understand UpdateItem parameters

Step 2: Confirm no syntax errors

Final Answer:

Quick Check:

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