CREATE TABLE table_name_8 (tries_against NUMBER, tries_for VARCHAR2, points_against VARCHAR2, points_for VARCHAR2)

Which Tries against has Points against larger than 156, and Points for of 127, and Tries for larger than 17?
SELECT AVG(tries_against) FROM table_name_8 WHERE points_against > 156 AND points_for = 127 AND tries_for > 17
SELECT AVG("tries_against") FROM "table_name_8" WHERE "points_against" > 156 AND "points_for" = 127 AND "tries_for" > 17