CREATE TABLE table_17531 ("Number" FLOAT, "Name" TEXT, "Titles" TEXT, "Date" TEXT, "Opponent" TEXT, "Result" TEXT, "Defenses" FLOAT)

Who was the opponent when the result was ud 12/12 and date was 1993-05-22?
SELECT "Opponent" FROM table_17531 WHERE "Result" = 'UD 12/12' AND "Date" = '1993-05-22'
SELECT "Opponent" FROM "table_17531" WHERE "Date" = '1993-05-22' AND "Result" = 'UD 12/12'