Which County has a Size larger than 258, and a Mascot of commodores?
CREATE TABLE "indiana_high_school_athletics_conference" (
  "school" text,
  "location" text,
  "mascot" text,
  "size" real,
  "ihsaa_class" text,
  "county" text
);
SELECT "county" FROM "indiana_high_school_athletics_conference" WHERE "size">258 AND "mascot"='commodores';