CREATE TABLE table_name_78 (session VARCHAR, discipline VARCHAR, event VARCHAR)

The 1977 Japanese Grand Prix in the open wheel discipline has what session?
SELECT session FROM table_name_78 WHERE discipline = "open wheel" AND event = "1977 japanese grand prix"
SELECT "session" FROM "table_name_78" WHERE "1977 japanese grand prix" = "event" AND "discipline" = "open wheel"