How many total catagories are there for La Paz? 
CREATE TABLE "irrigation_infrastructure" (
  "department" text,
  "micro_10ha" real,
  "small_100ha" real,
  "medium_500ha" real,
  "big_500ha" real,
  "total" real
);
SELECT COUNT("total") FROM "irrigation_infrastructure" WHERE "department"='La Paz';