Which carpet has a Clay of 1–0 and a Hard 1–1?
CREATE TABLE "head_to_head_record" (
  "record" text,
  "hard" text,
  "clay" text,
  "grass" text,
  "carpet" text
);
SELECT "carpet" FROM "head_to_head_record" WHERE "clay"='1–0' AND "hard"='1–1';