CREATE TABLE nomination (Artwork_ID VARCHAR2, Festival_ID VARCHAR2)
CREATE TABLE festival_detail (Festival_ID VARCHAR2, Year VARCHAR2)
CREATE TABLE artwork (Type VARCHAR2, Artwork_ID VARCHAR2)

Show distinct types of artworks that are nominated in festivals in 2007.
SELECT DISTINCT T2.Type FROM nomination AS T1 JOIN artwork AS T2 ON T1.Artwork_ID = T2.Artwork_ID JOIN festival_detail AS T3 ON T1.Festival_ID = T3.Festival_ID WHERE T3.Year = 2007
SELECT DISTINCT "T2"."Type" FROM "nomination" "T1" JOIN "artwork" "T2" ON "T1"."Artwork_ID" = "T2"."Artwork_ID" JOIN "festival_detail" "T3" ON "T1"."Festival_ID" = "T3"."Festival_ID" AND "T3"."Year" = 2007