CREATE TABLE "radio_series" (
  "date" text,
  "episode" real,
  "performer_1" text,
  "performer_2" text,
  "performer_3" text,
  "performer_4" text
);

Question: Who is the second performer in episode 5?
SQL: SELECT "performer_2" FROM "radio_series" WHERE "episode"=5;

Question: How many times was performer 3 Kate Robbins?
SQL: SELECT COUNT("date") FROM "radio_series" WHERE "performer_3"='Kate Robbins';

Question: Who was perfomer one on 30 January 1988?
SQL: SELECT "performer_1" FROM "radio_series" WHERE "date"='30 January 1988';

Question: Who was performer 4 when Kate Robbins was performer 3?
SQL: SELECT "performer_4" FROM "radio_series" WHERE "performer_3"='Kate Robbins';

Question: How many episodes was Jimmy Mulville performer 4?
SQL: SELECT COUNT("episode") FROM "radio_series" WHERE "performer_4"='Jimmy Mulville';