Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_name_77 (round INTEGER, overall VARCHAR, pick__number VARCHAR, position VARCHAR)
### Question:
What is the highest round with a pick# of 9, overll less than 468, and position of defensive back?
### Answer:
SELECT MAX(round) FROM table_name_77 WHERE pick__number = 9 AND position = "defensive back" AND overall < 468