What is the least value for average attendance when average on previous season is +644?
CREATE TABLE table_2970978_1 (ave_attendance INTEGER, ___ave_on_prev_season VARCHAR)
SELECT MIN(ave_attendance) FROM table_2970978_1 WHERE ___ave_on_prev_season = "+644"
### Context: CREATE TABLE table_2970978_1 (ave_attendance INTEGER, ___ave_on_prev_season VARCHAR) ### Question: What is the least value for average attendance when average on previous season is +644? ### Answer: SELECT MIN(ave_attendance) FROM table_2970978_1 WHERE ___ave_on_prev_season = "+644"