CREATE TABLE table_56417 ("Season" CLOB, "Cup FinalDate" CLOB, "WinningTeam" CLOB, "Score" CLOB, "LosingTeam" CLOB, "Cup Final Attendance" CLOB)

What team lost on 20 August 1989?
SELECT "LosingTeam" FROM table_56417 WHERE "Cup FinalDate" = '20 august 1989'
SELECT "LosingTeam" FROM "table_56417" WHERE "Cup FinalDate" = '20 august 1989'