CREATE TABLE festival_detail (festival_id DECIMAL, festival_name TEXT, chair_name TEXT, location TEXT, year DECIMAL, num_of_audience DECIMAL)
CREATE TABLE artwork (artwork_id DECIMAL, type TEXT, name TEXT)
CREATE TABLE nomination (artwork_id DECIMAL, festival_id DECIMAL, result TEXT)

List the year in which there are more than one festivals.
SELECT year FROM festival_detail GROUP BY year HAVING COUNT(*) > 1
SELECT "year" FROM "festival_detail" GROUP BY "year" HAVING COUNT(*) > 1