Table: doctorwho_audio_plays
Columns: series_sorted
title
doctor
featuring
released

Question: what is the released when the series is sorted 6y/ai?
SQL: SELECT "released" FROM doctorwho_audio_plays WHERE "series_sorted" = '6y/ai'

Question: who is the featuring when the doctor is the 6th and the series sorted is 6y/ak?
SQL: SELECT "featuring" FROM doctorwho_audio_plays WHERE "doctor" = '6th' AND "series_sorted" = '6y/ak'

Question: what is the series sorted when the released is may 2012?
SQL: SELECT "series_sorted" FROM doctorwho_audio_plays WHERE "released" = 'may 2012'

Question: who is the featuring when the series sorted is 6eb/b?
SQL: SELECT "featuring" FROM doctorwho_audio_plays WHERE "series_sorted" = '6eb/b'