Question: What is the last name of the musician that has been at the back position the most?
Schema: create table band (lastname varchar, id varchar, PRIMARY KEY (lastname)); create table performance (bandmate varchar, PRIMARY KEY (bandmate))
SQL: select t2.lastname from performance as t1 join band as t2 on t1.bandmate = t2.id where stageposition = "back" group by lastname order by count(*) desc limit 1