CREATE TABLE table_44940 ("Round" FLOAT, "Pick" FLOAT, "Player" TEXT, "Position" TEXT, "School/Club Team" TEXT)

Name the Round which has a Position of defensive back and a Pick of 226?
SELECT MIN("Round") FROM table_44940 WHERE "Position" = 'defensive back' AND "Pick" = '226'
SELECT MIN("Round") FROM "table_44940" WHERE "Pick" = '226' AND "Position" = 'defensive back'