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 NUMBER)
CREATE TABLE exhibition_record (exhibition_id NUMBER, date CLOB, attendance NUMBER)

Return the name and country corresponding to the artist who has had the most exhibitions.
SELECT T2.name, T2.country FROM exhibition AS T1 JOIN artist AS T2 ON T1.artist_id = T2.artist_id GROUP BY T1.artist_id ORDER BY COUNT(*) DESC LIMIT 1
SELECT "T2"."name", "T2"."country" FROM "exhibition" "T1" JOIN "artist" "T2" ON "T1"."artist_id" = "T2"."artist_id" GROUP BY "T1"."artist_id" ORDER BY COUNT(*) DESC FETCH FIRST 1 ROWS ONLY