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

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