What is Larry Centers' average number when there were less than 600 yards?
CREATE TABLE table_name_23 (number INTEGER, player VARCHAR, yards VARCHAR)
SELECT AVG(number) FROM table_name_23 WHERE player = "larry centers" AND yards < 600
### Context: CREATE TABLE table_name_23 (number INTEGER, player VARCHAR, yards VARCHAR) ### Question: What is Larry Centers' average number when there were less than 600 yards? ### Answer: SELECT AVG(number) FROM table_name_23 WHERE player = "larry centers" AND yards < 600