What sort of query functionality is supported by DynamoDB?
* GET/PUT operations that use the user-defined unique identifier are supported.
* By enabling querying of a non-primary key characteristic using both local and global secondary indexes, it offers flexible querying.
* Data for an item linked to a single attribute separation primary key can be read and written quickly.
* It enables you to access all the items for a single aggregate partition-sort key along a number of sort keys using the Query API.
