谁可以帮我解答这个Query的问题？？谢谢
总共2个table
Sample table1: <--名字是customer
customerID customerName
  1 sima
  2 melven
  3 spidey
  4 anna
  5 squallsoh

Sample table2: <--名字是orders
orderID customerID orderItem
  1 2 pen
  2 2 rubber
  3 1 pen
  4 2 books
  5 5 books


Task: write an SQL query to identify which customer has the most orders in the systems
(找出那个customer下了最多的order）


------解决方案--------------------

SQL code

select o.customerID,c.customerID,count(*)
from orders o inner join customer c on o.customerID=c.customerID
group by o.customerID,c.customerID
order by 2 desc
limit 1