CREATE TABLE table_name_2 (attendance VARCHAR, opponent VARCHAR, result VARCHAR)

What is the number of attendance values for ties having an opponent of Middlesbrough and result of 3-1?
SELECT COUNT(attendance) FROM table_name_2 WHERE opponent = "middlesbrough" AND result = "3-1"
SELECT COUNT("attendance") FROM "table_name_2" WHERE "3-1" = "result" AND "middlesbrough" = "opponent"