CREATE TABLE table_name_8 (sites NUMBER, screens VARCHAR2, rank VARCHAR2)

what is the number of sites when the number of screens is 687 and rank is more than 7?
SELECT AVG(sites) FROM table_name_8 WHERE screens = 687 AND rank > 7
SELECT AVG("sites") FROM "table_name_8" WHERE "rank" > 7 AND "screens" = 687