CREATE TABLE table_17529 ("Number" FLOAT, "Name" TEXT, "Titles" TEXT, "Date" TEXT, "Opponent" TEXT, "Result" TEXT, "Defenses" FLOAT)

How many times was pernell whitaker an opponent?
SELECT COUNT("Date") FROM table_17529 WHERE "Opponent" = 'Pernell Whitaker'
SELECT COUNT("Date") FROM "table_17529" WHERE "Opponent" = 'Pernell Whitaker'