Write a query to display the patron ID, first and last name of all patrons that have never checked out any book. Sort the result by patron last name and then first name. (See the figure below for the output) Write a query to display the patron ID and the average number of days that patron keeps books during a checkout. Limit the results to only patrons who have at least three checkouts.  Sort the results in descending order by the average days the book is kept. (See the figure below for the output)

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Single Table

In a database management system, a single table is designed to obtain data of heterogeneous items. A single-table design with DynamoDB resolves the issue of raising multiple requests for the relevant data of an entity.