CREATE TABLE table_31301 ("Season" CLOB, "Ave. Attendance" FLOAT, "+/- ave. on prev. season" CLOB, "Competition" CLOB, "Occupier" CLOB)

How many values of attendance occur when ave. on previous season is +645?
SELECT COUNT("Ave. Attendance") FROM table_31301 WHERE "+/- ave. on prev. season" = '+645'
SELECT COUNT("Ave. Attendance") FROM "table_31301" WHERE "+/- ave. on prev. season" = '+645'