CREATE TABLE table_11866 ("Season" FLOAT, "Premier" TEXT, "Runner Up" TEXT, "Score" TEXT, "Venue" TEXT, "Attendance" FLOAT, "Premiership" TEXT)

If the season is before 2000, the runner up was north melbourne, and it's the pre-season cup, what's the sum of attendees?
SELECT SUM("Attendance") FROM table_11866 WHERE "Premiership" = 'pre-season cup' AND "Runner Up" = 'north melbourne' AND "Season" < '2000'
SELECT SUM("Attendance") FROM "table_11866" WHERE "Premiership" = 'pre-season cup' AND "Runner Up" = 'north melbourne' AND "Season" < '2000'