CREATE TABLE "featured_artist_one_hit_wonders" (
  "song" text,
  "featured_artist" text,
  "main_artist" text,
  "peak_date" text,
  "peak" real
);

Question: What was the peak date of Kelis's song?
SQL: SELECT "peak_date" FROM "featured_artist_one_hit_wonders" WHERE "main_artist"='kelis';