What school is from 45 Lake county and is located in Merrillville?
CREATE TABLE "indiana_high_school_athletics_conference" (
  "school" text,
  "mascot" text,
  "location" text,
  "enrollment" real,
  "ihsaa_class" text,
  "ihsaa_football_class" text,
  "county" text
);
SELECT "school" FROM "indiana_high_school_athletics_conference" WHERE "county"='45 lake' AND "location"='merrillville';