CREATE TABLE table_10233 ("Date" TEXT, "Venue" TEXT, "Opponent" TEXT, "Result" TEXT, "Competition" TEXT)

Which opponent is friendly and played on 15-08-2012?
SELECT "Opponent" FROM table_10233 WHERE "Competition" = 'friendly' AND "Date" = '15-08-2012'
SELECT "Opponent" FROM "table_10233" WHERE "Competition" = 'friendly' AND "Date" = '15-08-2012'