CREATE TABLE exhibition (Exhibition_ID INT, Year INT, Theme TEXT, Artist_ID INT, Ticket_Price FLOAT)
CREATE TABLE exhibition_record (Exhibition_ID INT, Date TEXT, Attendance INT)
CREATE TABLE artist (Artist_ID INT, Name TEXT, Country TEXT, Year_Join INT, Age INT)

Group by the theme and count the year with a stacked bar chart, I want to list by the the number of year from low to high.
SELECT Year, COUNT(Year) FROM exhibition GROUP BY Theme ORDER BY COUNT(Year)
SELECT "Year", COUNT("Year") FROM "exhibition" GROUP BY "Theme" ORDER BY COUNT("Year") NULLS FIRST