CREATE TABLE table_name_52 (round INT, pick__number VARCHAR, position VARCHAR)

Which Round is the average one that has a Pick # larger than 26, and a Position of defensive back?
SELECT AVG(round) FROM table_name_52 WHERE pick__number > 26 AND position = "defensive back"
SELECT AVG("round") FROM "table_name_52" WHERE "defensive back" = "position" AND "pick__number" > 26