CREATE TABLE table_78511 ("Home team" TEXT, "Home team score" TEXT, "Away team" TEXT, "Away team score" TEXT, "Venue" TEXT, "Crowd" FLOAT, "Date" TEXT)

Who was the home team at MCG?
SELECT "Home team" FROM table_78511 WHERE "Venue" = 'mcg'
SELECT "Home team" FROM "table_78511" WHERE "Venue" = 'mcg'