CREATE TABLE table_name_57 (team_2 VARCHAR2)

What is 2nd Leg, when Team 2 is 'Dunaferr'?
SELECT 2 AS nd_leg FROM table_name_57 WHERE team_2 = "dunaferr"
SELECT 2 AS "nd_leg" FROM "table_name_57" WHERE "dunaferr" = "team_2"