Which Paul McCartney has a Linda McCartney of keyboards?
CREATE TABLE "instruments_played_by_band_members" (
  "paul_mc_cartney" text,
  "stuart" text,
  "mc_intosh" text,
  "whitten" text,
  "linda_mc_cartney" text
);
SELECT "paul_mc_cartney" FROM "instruments_played_by_band_members" WHERE "linda_mc_cartney"='keyboards';