You run a DynamoDB query on a single-table design with KeyConditionExpression: PK = :pk AND SK = :sk but receive no results, even though you know the item exists. What is a common cause of this issue?

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DynamoDB - Access Patterns and Query Optimization

You run a DynamoDB query on a single-table design with KeyConditionExpression: PK = :pk AND SK = :sk but receive no results, even though you know the item exists. What is a common cause of this issue?

AThe table does not support queries with both PK and SK conditions

BThe attribute values for :pk or :sk do not exactly match the stored keys

CThe query syntax does not allow equality on SK

DDynamoDB does not support querying on composite keys

Step-by-Step Solution

Solution:

Step 1: Verify exact key values
Queries with equality conditions require exact matches on PK and SK values.
Step 2: Common mistake
Using incorrect or partial values for :pk or :sk causes no results.
Final Answer:
The attribute values for :pk or :sk do not exactly match the stored keys -> Option B
Quick Check:
Confirm exact key values used in query [OK]

Quick Trick: Exact key values required for equality queries [OK]

Common Mistakes:

MISTAKES

Using partial or incorrect key values in query
Assuming SK can be queried with inequality without begins_with
Misunderstanding query syntax for composite keys

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You run a DynamoDB query on a single-table design with KeyConditionExpression: PK = :pk AND SK = :sk but receive no results, even though you know the item exists. What is a common cause of this issue?

Step 1: Verify exact key values

Step 2: Common mistake

Final Answer:

Quick Check:

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