CREATE TABLE table_name_18 (season VARCHAR, agg VARCHAR, opponent VARCHAR)

Which Season has an Agg of 4 1, and an Opponent of rapid wien?
SELECT season FROM table_name_18 WHERE agg = "4–1" AND opponent = "rapid wien"
SELECT "season" FROM "table_name_18" WHERE "4–1" = "agg" AND "opponent" = "rapid wien"