Database: icfp_1
Question: Which author has written the most papers? Find his or her last name.
SQL:
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 GROUP BY t1.fname ,  t1.lname ORDER BY count(*) DESC LIMIT 1