CREATE TABLE table_name_18 (runner_up VARCHAR2, rank VARCHAR2, champion VARCHAR2, fourth_place VARCHAR2)

What was the runner-up when champion is 0, 4th place is 0 and rank is 6?
SELECT runner_up FROM table_name_18 WHERE champion = "0" AND fourth_place = "0" AND rank = 6
SELECT "runner_up" FROM "table_name_18" WHERE "0" = "champion" AND "0" = "fourth_place" AND "rank" = 6