CREATE TABLE table_60478 ("Edition" TEXT, "Round" TEXT, "Date" TEXT, "Surface" TEXT, "Opponent" TEXT, "Result" TEXT)

What's the result for the clay surface edition on july 17, 1992?
SELECT "Result" FROM table_60478 WHERE "Surface" = 'clay' AND "Date" = 'july 17, 1992'
SELECT "Result" FROM "table_60478" WHERE "Date" = 'july 17, 1992' AND "Surface" = 'clay'