CREATE TABLE table_78089 ("Home team" TEXT, "Home team score" TEXT, "Away team" TEXT, "Away team score" TEXT, "Venue" TEXT, "Crowd" FLOAT, "Date" TEXT)

What home team played at MCG?
SELECT "Away team" FROM table_78089 WHERE "Venue" = 'mcg'
SELECT "Away team" FROM "table_78089" WHERE "Venue" = 'mcg'