CREATE TABLE table_name_93 (fis_nordic_world_ski_championships VARCHAR2, winter_olympics VARCHAR2)

What is the FIS Nordic World Ski Championship years when the winter Olympics took place in 1968?
SELECT fis_nordic_world_ski_championships FROM table_name_93 WHERE winter_olympics = 1968
SELECT "fis_nordic_world_ski_championships" FROM "table_name_93" WHERE "winter_olympics" = 1968