What is the name and country for the artist with most number of exhibitions?
CREATE TABLE exhibition (artist_id VARCHAR); CREATE TABLE artist (name VARCHAR, country VARCHAR, artist_id VARCHAR)
[SQL] 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 [/SQL]