CREATE TABLE artist (Artist_ID INT, Name TEXT, Country TEXT, Year_Join INT, Age INT)
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)

Find those years for all exhibitions with ticket prices lower than 15, group by year, and count year, and display by the the number of year from high to low.
SELECT Year, COUNT(Year) FROM exhibition WHERE Ticket_Price < 15 GROUP BY Year ORDER BY COUNT(Year) DESC
SELECT "Year", COUNT("Year") FROM "exhibition" WHERE "Ticket_Price" < 15 GROUP BY "Year" ORDER BY COUNT("Year") DESC NULLS LAST