You wrote a query with KeyConditionExpression 'PK = :pk and SK > :sk' but get an error. What is a likely cause?

medium📝 Debug Q6 of 15

DynamoDB - Access Patterns and Query Optimization

AUsing a greater than operator on the sort key is invalid

BThe query must use begins_with instead of >

CThe partition key value :pk is missing or incorrect

DThe sort key attribute is not defined in the table

Step-by-Step Solution

Solution:

Step 1: Check KeyConditionExpression requirements
Partition key must be specified exactly in a query; missing or wrong value causes errors.
Step 2: Evaluate options
The partition key value :pk is missing or incorrect is likely because without a valid partition key, the query fails. Using a greater than operator on the sort key is invalid is false; > is valid on sort key. The sort key attribute is not defined in the table would cause different errors. The query must use begins_with instead of > is incorrect; > is allowed.
Final Answer:
The partition key value :pk is missing or incorrect -> Option C
Quick Check:
Partition key required and correct = D [OK]

Quick Trick: Partition key must be exact and present in query [OK]

Common Mistakes:

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