Table: buffalo_bills_1981
Columns: week
date
opponent
result
attendance

Question: What was the attendance when they played at Dallas Cowboys?
SQL: SELECT "attendance" FROM buffalo_bills_1981 WHERE "opponent" = 'at dallas cowboys'

Question: What was the attendance at the game before week 8, held on October 25, 1981?
SQL: SELECT SUM("attendance") FROM buffalo_bills_1981 WHERE "date" = 'october 25, 1981' AND "week" < 8

Question: What was the date of the game played after week 15?
SQL: SELECT "date" FROM buffalo_bills_1981 WHERE "week" > 15