SELECT t1.customer_name FROM customers AS t1 JOIN customer_orders AS t2 ON t1.customer_id  =  t2.customer_id JOIN order_items AS t3 ON t2.order_id  =  t3.order_id GROUP BY t1.customer_name ORDER BY sum(t3.order_quantity) DESC LIMIT 1
What is the name of the customer that has purchased the most items?
SELECT t1.customer_name FROM customers AS t1 JOIN customer_orders AS t2 ON t1.customer_id = t2.customer_id JOIN order_items AS t3 ON t2.order_id = t3.order_id GROUP BY t1.customer_name ORDER BY sum ( t3.order_quantity ) DESC LIMIT 1
select t1 . customer_name from customers as t1 join customer_orders as t2 on t1 . customer_id = t2 . customer_id join order_items as t3 on t2 . order_id = t3 . order_id group by t1 . customer_name order by sum ( t3 . order_quantity ) desc limit value
What is the name of the customer that has purchased the most items ?