Question: How many losingteams were for the cup finaldate 20 August 1989?
SQL: SELECT COUNT("LosingTeam") FROM "1-12028543-3" WHERE "Cup FinalDate" = '20 August 1989';

Question: How many seasons was the losing team Adelaide City?
SQL: SELECT COUNT("Season") FROM "1-12028543-3" WHERE "LosingTeam" = 'Adelaide City';

Question: Who was the winning team in the 1989 season?
SQL: SELECT "WinningTeam" FROM "1-12028543-3" WHERE "Season" = '1989';