CREATE TABLE visitor (name VARCHAR(255), age VARCHAR(255), id VARCHAR(255)); CREATE TABLE visit (visitor_id VARCHAR(255), num_of_ticket VARCHAR(255))
Find the name and age of the visitor who bought the most tickets at once.
    
SQL: SELECT t1.name, t1.age FROM visitor AS t1 JOIN visit AS t2 ON t1.id = t2.visitor_id ORDER BY t2.num_of_ticket DESC LIMIT 1