Question: What is the Season when league shows Bundesliga, and a European competition of Played Korac Cup?
SQL: SELECT "Season" FROM "2-15427957-1" WHERE "League" = 'Bundesliga' AND "European competitions" = 'Played Korac Cup';

Question: What is the average Tier when the postseason shows -, and the season is 2012–13?
SQL: SELECT AVG("Tier") FROM "2-15427957-1" WHERE "Postseason" = '–' AND "Season" = '2012–13';

Question: What is the European competition when the tier is more than 2?
SQL: SELECT "European competitions" FROM "2-15427957-1" WHERE "Tier" > 2.0;