What is Set 2, when Score is 3-0, when Date is May 11, and when Set 1 is 25-20?
CREATE TABLE "results_pool_b" (
  "date" text,
  "score" text,
  "set_1" text,
  "set_2" text,
  "set_3" text,
  "set_4" text,
  "set_5" text,
  "total" text
);
SELECT "set_2" FROM "results_pool_b" WHERE "score"='3-0' AND "date"='may 11' AND "set_1"='25-20';