CREATE TABLE table_name_99 (attendance NUMBER, venue VARCHAR2, scorers VARCHAR2)

What is the number of people in attendance when venue shows A, and Di Matteo, M. Hughes were the scorers?
SELECT SUM(attendance) FROM table_name_99 WHERE venue = "a" AND scorers = "di matteo, m. hughes"
SELECT SUM("attendance") FROM "table_name_99" WHERE "a" = "venue" AND "di matteo, m. hughes" = "scorers"