Who is performing in the back stage position for the song "Der Kapitan"? Show the first name and last name.
create table band (firstname varchar, lastname varchar, id varchar, PRIMARY KEY (firstname)); create table performance (bandmate varchar, songid varchar, stageposition varchar, PRIMARY KEY (bandmate)); create table songs (songid varchar, title varchar, PRIMARY KEY (songid))
select t2.firstname, t2.lastname from performance as t1 join band as t2 on t1.bandmate = t2.id join songs as t3 on t3.songid = t1.songid where t3.title = "der kapitan" and t1.stageposition = "back"