CREATE TABLE table_80019 ("Sport" TEXT, "League" TEXT, "Tier" TEXT, "Club" TEXT, "Stadium" TEXT)

Which tier is for football at Tianhe Stadium?
SELECT "Tier" FROM table_80019 WHERE "Sport" = 'football' AND "Stadium" = 'tianhe stadium'
SELECT "Tier" FROM "table_80019" WHERE "Sport" = 'football' AND "Stadium" = 'tianhe stadium'