What is the WIAA classification of Oakland Alternative High School? 
CREATE TABLE "high_schools_grades_9_12" (
  "high_school" text,
  "type" text,
  "established" real,
  "enrollment" real,
  "mascot" text,
  "wiaa_classification" text,
  "notes" text
);
SELECT "wiaa_classification" FROM "high_schools_grades_9_12" WHERE "high_school"='Oakland Alternative';