Hom many musicians performed in the song "Flash"?
create table performance (bandmate varchar, songid varchar, PRIMARY KEY (bandmate)); create table songs (songid varchar, title varchar, PRIMARY KEY (songid)); create table band (id varchar, PRIMARY KEY (id))
select count(*) 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 = "flash"