SELECT t1.id ,  t1.name ,  t1.age FROM visitor AS t1 JOIN visit AS t2 ON t1.id  =  t2.visitor_id GROUP BY t1.id HAVING count(*)  >  1
find the id, name and age for visitors who visited some museums more than once.
SELECT t1.id , t1.name , t1.age FROM visitor AS t1 JOIN visit AS t2 ON t1.id = t2.visitor_id GROUP BY t1.id HAVING count ( * ) > 1
select t1 . id , t1 . name , t1 . age from visitor as t1 join visit as t2 on t1 . id = t2 . visitor_id group by t1 . id having count ( * ) > value
find the id , name and age for visitors who visited some museums more than once .