CREATE TABLE exhibition_record (exhibition_id DECIMAL, date TEXT, attendance DECIMAL)
CREATE TABLE exhibition (exhibition_id DECIMAL, year DECIMAL, theme TEXT, artist_id DECIMAL, ticket_price DECIMAL)
CREATE TABLE artist (artist_id DECIMAL, name TEXT, country TEXT, year_join DECIMAL, age DECIMAL)

Show theme and year for all exhibitions in an descending order of ticket price.
SELECT theme, year FROM exhibition ORDER BY ticket_price DESC
SELECT "theme", "year" FROM "exhibition" ORDER BY "ticket_price" DESC NULLS LAST