CREATE TABLE table_438 ("Overall Pick #" FLOAT, "AFL Team" CLOB, "Player" CLOB, "Position" CLOB, "College" CLOB)

What is the pick number of the defensive back?
SELECT COUNT("Overall Pick #") FROM table_438 WHERE "Position" = 'Defensive Back'
SELECT COUNT("Overall Pick #") FROM "table_438" WHERE "Position" = 'Defensive Back'