SELECT t1.email_address FROM customers AS t1 JOIN complaints AS t2 ON t1.customer_id  =  t2.customer_id GROUP BY t1.customer_id ORDER BY count(*) LIMIT 1
What are the emails of customers who have filed complaints on the product which has had the greatest number of complaints?
SELECT t1.email_address FROM customers AS t1 JOIN complaints AS t2 ON t1.customer_id = t2.customer_id GROUP BY t1.customer_id ORDER BY count ( * ) LIMIT 1
select t1 . email_address from customers as t1 join complaints as t2 on t1 . customer_id = t2 . customer_id group by t1 . customer_id order by count ( * ) limit value
What are the emails of customers who have filed complaints on the product which has had the greatest number of complaints ?