What are all the papers?
select * from papers
Give me those whose title contains "Monadic".
select * from papers where title like "%monadic%"
Who wrote any of those? Give me the last names only.
select t1.lname from authors as t1 join authorship as t2 on t1.authid = t2.authid join papers as t3 on t2.paperid = t3.paperid where t3.title like "%monadic%"