CREATE TABLE table_11786 ("Home team" TEXT, "Home team score" TEXT, "Away team" TEXT, "Away team score" TEXT, "Venue" TEXT, "Crowd" FLOAT, "Date" TEXT)

What is the lowest crowd when essendon is the away team?
SELECT MIN("Crowd") FROM table_11786 WHERE "Away team" = 'essendon'
SELECT MIN("Crowd") FROM "table_11786" WHERE "Away team" = 'essendon'