586. Customer Placing the Largest Number of Orders
https://leetcode.com/articles/customer-placing-the-largest-number-of-orders/
--It can handle the case where more than one customer can have maximum number of orders.
select customer_number from orders
group by customer_number
having count(order_number) in
(
select count(order_number) from orders
group by customer_number
order by count(order_number) desc
limit 1
);
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