CREATE TABLE "lifts" (
  "lift_name" text,
  "type" text,
  "length" real,
  "vertical" real,
  "cap_hour" real
);

Question: Tell me the sum of cap/hor for double chair and vertical less than 479
SQL: SELECT SUM("cap_hour") FROM "lifts" WHERE "type"='double chair' AND "vertical"<479;