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

What are the names of the chairs of festivals, sorted in ascending order of the year held?
SELECT chair_name FROM festival_detail ORDER BY year
SELECT "chair_name" FROM "festival_detail" ORDER BY "year" NULLS FIRST