DynamoDB - with AWS SDK
You want to update a DynamoDB item to increment a numeric attribute "score" by 5 using SDK helpers. Which code snippet correctly builds the UpdateExpression and attribute values?
You want to update a DynamoDB item to increment a numeric attribute "score" by 5 using SDK helpers. Which code snippet correctly builds the UpdateExpression and attribute values?
hard🚀 Application Q15 of 15
Step-by-Step Solution
Solution:
Step 1: Use placeholders for attribute names
Since "score" is an attribute name, use ExpressionAttributeNames with #s placeholder.Step 2: Build UpdateExpression correctly
Use "set #s = #s + :inc" to increment score by value in :inc.Step 3: Provide ExpressionAttributeValues
Set ":inc" to 5 to add 5 to score.Final Answer:
UpdateExpression: "set #s = #s + :inc", ExpressionAttributeNames: { "#s": "score" }, ExpressionAttributeValues: { ":inc": 5 } -> Option CQuick Check:
Use placeholders for names and values [OK]
Quick Trick: Use # for names and : for values in expressions [OK]
Common Mistakes:
MISTAKES- Not using ExpressionAttributeNames for attribute names
- Using unsupported syntax like 'increment score by 5'
- Using 'add' without placeholders
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