CREATE TABLE table_928 ("Week" FLOAT, "Date" TEXT, "Opponent" TEXT, "Result" TEXT, "Stadium" TEXT, "Record" TEXT, "Attendance" FLOAT)

what is the minimum attendance with stadium being cotton bowl
SELECT MIN("Attendance") FROM table_928 WHERE "Stadium" = 'Cotton Bowl'
SELECT MIN("Attendance") FROM "table_928" WHERE "Stadium" = 'Cotton Bowl'