CREATE TABLE table_name_57 (opponent_in_the_final VARCHAR2, date VARCHAR2)

What Opponent in the final has a Date of 19 september 1988?
SELECT opponent_in_the_final FROM table_name_57 WHERE date = "19 september 1988"
SELECT "opponent_in_the_final" FROM "table_name_57" WHERE "19 september 1988" = "date"