Show the Document code for document type code Book?
select document_code from documents where document_type_code = 'Book'
Show the name of the document that has been accessed the greatest number of times?
select document_name from documents order by access_count desc limit 1
Show the name of the documents and the count of how many times each has been accessed?
select document_name, access_count from documents order by access_count desc limit 1