CREATE TABLE table_78093 ("Home team" TEXT, "Home team score" TEXT, "Away team" TEXT, "Away team score" TEXT, "Venue" TEXT, "Crowd" FLOAT, "Date" TEXT)

What was the lowest crowd size at MCG?
SELECT MIN("Crowd") FROM table_78093 WHERE "Venue" = 'mcg'
SELECT MIN("Crowd") FROM "table_78093" WHERE "Venue" = 'mcg'