CREATE TABLE "singles_18_itf" (
  "date" text,
  "tournament" text,
  "surface" text,
  "opponent_in_the_final" text,
  "score" text
);

Question: Which tournament has hard as the surface and apr. 12, 1998 as the date?
SQL: SELECT "tournament" FROM "singles_18_itf" WHERE "surface"='hard' AND "date"='apr. 12, 1998';

Question: Which surface has wynne prakusya as the opponent in the final?
SQL: SELECT "surface" FROM "singles_18_itf" WHERE "opponent_in_the_final"='wynne prakusya';

Question: What score has wynne prakusya as the opponent in the final?
SQL: SELECT "score" FROM "singles_18_itf" WHERE "opponent_in_the_final"='wynne prakusya';

Question: What tournament has nov. 21, 1999 as the date?
SQL: SELECT "tournament" FROM "singles_18_itf" WHERE "date"='nov. 21, 1999';