Is this Join Query Syntax Correct???

Question

Is this syntax correct for this query question?  Would "used Vista cards" reflect the OrderDate Column in the where clause.  The table is from Adventureworks2012.
How many Sales Orders (Headers) used Vista credit cards in October 2002 
SELECT C.CardType, COUNT(*)
FROM Sales.SalesOrderHeader S 
JOIN Sales.CreditCard
  C
ON S.CreditCardID=c.CreditCardID
WHERE C.CardType = 'Vista'
AND S.OrderDate  between '10/1/2002' and '10/31/2002'
GROUP BY c.CardType
  

Answer 1

That is correct, but be careful when writing queries where a datetime column is compared to a period of time.  In this case it looks like the time portions of OrderDate are all set to the beginning of day (00:00:00.000) so your query works as long as
that assumption is correct.  The better way is to use an upper boundary of the next day (which means you cannot use between).  E.g., 
select ... where S.OrderDate >= '20021001' and S.OrderDate < '20021101' 
group by ...
order by ...;
If you search for the forum for "Tibor" you should be able to find a link to his website where he goes into much more detail about the tricky usage of the datetime datatype.