Column is invalid in select

Question

How I will properly do this:

Customer

CusID, CusLname, CusFname, CusMname, CusAddress, CusEmailAdd

Order

OrderID,  Ord         


        

Answer 1

A little bit different version (from that Gordon Linoff suggests):

select
     cnt, c.CusID, CusLname, CusFname, CusMname, CusAddress, CusEmailAdd
from Customer c 
join (
    select  
        count(OrderID) cnt, CusID
    from Order o 
    group by
        CusID
) o on
    c.CusID = o.CusID
order by
    c.CusID // ordering by OrderID and Order is out of logic :)