Hi there!  Can you show me a list of all of the different document names and the associated access count for each of them?
select document_name, access_count from documents
Wonderful!  Can you show me the associated structure code for each of those document names?
select document_structure_code from documents
Can you filter that list to show the document name and document structure code with the fewest document structure code entries, or in other words, the least popular structure?
select document_name,document_structure_code from documents where document_structure_code = ( select min ( document_structure_code ) from documents )
Very nice!  Finally, could you update this list to show the average access count for these two documents?
select avg ( access_count ) from documents where document_structure_code = ( select min ( document_structure_code ) from documents ) group by document_name