CREATE TABLE table_name_35 (example_code__huc_ NUMBER, level VARCHAR2, example_name VARCHAR2, digits VARCHAR2)

What is the mean huc example code when the example name's lower snake, there are 6 digits, and less than 3 levels?
SELECT AVG(example_code__huc_) FROM table_name_35 WHERE example_name = "lower snake" AND digits = 6 AND level < 3
SELECT AVG("example_code__huc_") FROM "table_name_35" WHERE "digits" = 6 AND "example_name" = "lower snake" AND "level" < 3