CREATE TABLE table_name_20 (school VARCHAR2, round VARCHAR2, pick VARCHAR2, position VARCHAR2)

Which school picked a back in round 16, after pick 89?
SELECT school FROM table_name_20 WHERE pick > 89 AND position = "back" AND round = 16
SELECT "school" FROM "table_name_20" WHERE "back" = "position" AND "pick" > 89 AND "round" = 16