CREATE TABLE "by_school" (
  "school" text,
  "years_of_participation" text,
  "occ_championships" real,
  "last_occ_championship" text,
  "last_outright_occ_championship" text
);

Question: How many times have Central Crossing won the OCC Championship?
SQL: SELECT SUM("occ_championships") FROM "by_school" WHERE "school"='central crossing';