CREATE TABLE table_12313 ("Date" TEXT, "Location" TEXT, "Score" TEXT, "Result" TEXT, "Competition" TEXT)

What date has a result of win, in a friendly competition in Porto?
SELECT "Date" FROM table_12313 WHERE "Result" = 'win' AND "Competition" = 'friendly' AND "Location" = 'porto'
SELECT "Date" FROM "table_12313" WHERE "Competition" = 'friendly' AND "Location" = 'porto' AND "Result" = 'win'