GetItem (reading single item) in DynamoDB - Cheat Sheet & Quick Revision

Recall & Review

beginner

What does the GetItem operation do in DynamoDB?

GetItem retrieves a single item from a DynamoDB table using its primary key.

beginner

Which key attribute(s) must you provide to use GetItem?

You must provide the full primary key, which can be a partition key alone or a combination of partition key and sort key.

beginner

True or False: GetItem can return multiple items at once.

False. GetItem returns only one item based on the specified primary key.

beginner

What happens if the item with the specified key does not exist in GetItem?

GetItem returns no data (an empty result), indicating the item was not found.

intermediate

How can you limit the attributes returned by GetItem?

You can specify a ProjectionExpression to return only certain attributes of the item.

What is required to perform a GetItem operation in DynamoDB?

A Secondary index name

B Primary key of the item

C Partition key and sort key always

D Table name only

GetItem requires the primary key, which can be just the partition key or both partition and sort key if the table uses a composite key.

If you want only specific attributes from an item, which parameter do you use in GetItem?

A ProjectionExpression

B FilterExpression

C KeyConditionExpression

D UpdateExpression

ProjectionExpression lets you specify which attributes to return in the GetItem result.

What does GetItem return if the item does not exist?

A An error

B All items in the table

C The last item inserted

D An empty result

GetItem returns an empty result if no item matches the key.

Can GetItem be used to read multiple items at once?

A No, it returns only one item per call

B Yes, it returns all items with the same partition key

C Yes, if you specify multiple keys

D No, it only deletes items

GetItem reads only one item per request based on the primary key.

Which of these is NOT part of a GetItem request?

A TableName

B Key

C UpdateExpression

D ProjectionExpression

UpdateExpression is used in update operations, not in GetItem.

Explain how you use GetItem to retrieve a single item from a DynamoDB table.

Think about what information you need to find exactly one item.

What are the differences between GetItem and Query in DynamoDB?

Compare single item retrieval vs multiple items retrieval.