human
Considering the provided database schema and associated query, produce SQL code to retrieve the answer to the query. 
###Database Schema: Season, Average Attendance Home, Highest Attendance Home, Average Attendance Away, Highest Attendance Away, Division / Section, Level, Average Attendance League
###Question: How many season have an average attendance league of 2.456?
gpt
SELECT SUM Season FROM table WHERE Average Attendance League = 2.456