Question: Who is performing in the back stage position for the song "Der Kapitan"? Show the first name and last name.
Schema: 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))
SQL: 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"