Simple Primary Key: A simple primary key is a single attribute that acts as the unique identifier for each item in the table. For example, in a table of users, a simple primary key could be the user ID. With this type of primary key, you can retrieve a single item using the user ID.

Composite Primary Key: A composite primary key is composed of two attributes, a partition key and a sort key. The partition key distributes data across partitions, while the sort key provides a secondary ordering, allowing you to retrieve items in a specific sort order. For example, in a table of music albums, the partition key could be the artist name and the sort key could be the album release date. With this type of primary key, you can retrieve all albums for a specific artist, and then sort them by release date.

Partition Key and Sort Key: A partition key and sort key is another term for a composite primary key. The partition key is used to distribute data across partitions, and the sort key is used to order data within each partition. For example, in a table of books, the partition key could be the author name and the sort key could be the publication date. With this type of primary key, you can retrieve all books by a specific author, and then sort them by publication date.

Partition Key Only: A partition key only is another term for a simple primary key. This is a single attribute that acts as the unique identifier for each item in the table. For example, in a table of customers, the partition key could be the customer ID. With this type of primary key, you can retrieve a single customer by their customer ID.

I hope this provides a clearer understanding of the different primary key types in Amazon DynamoDB.

DynamoDB

AmazonWebServices

NoSQL

Database

PrimaryKey

SimplePrimaryKey

CompositePrimaryKey

PartitionKey

SortKey

CloudComputing

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