CREATE TABLE table_34799 ("Player" CLOB, "Number" FLOAT, "Yards" FLOAT, "Average" FLOAT, "Long" FLOAT, "Touchdowns" FLOAT)

What is Larry Centers' average number when there were less than 600 yards?
SELECT AVG("Number") FROM table_34799 WHERE "Player" = 'larry centers' AND "Yards" < '600'
SELECT AVG("Number") FROM "table_34799" WHERE "Player" = 'larry centers' AND "Yards" < '600'