Question : Update table basxed on results of query

Experts, I have the following temp table @tmpContacts:

ContactID ClientID NumContactsNeeded NumContactsMade TimePeriod
------------- ---------- --------------------------- ------------------------ --------------
1      3        2        NULL        Day
2      4        1        NULL        Week
3      5 1        NULL        Month

I am trying to update the NumContactsMade field using the following query:

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UPDATE @tmpContacts
SET NumContactsMade = b.Contacts FROM
	(
		SELECT ClientID, SUM(Contacts) AS Contacts 
		FROM 
			(
				SELECT ClientID, COUNT(Client_Contact_Tbl.ClientID) AS Contacts
				FROM Client_Contact_Tbl
				GROUP BY ClientID, Contact_Status, ContactDate
				HAVING Contact_Status IS NOT NULL AND ContactDate >= '6/20/2010'
			) a
		GROUP BY a.ClientID
	) b, @tmpContacts

Which is giving me the following results:

ContactID ClientID NumContactsNeeded NumContactsMade TimePeriod
------------- ---------- --------------------------- ------------------------ --------------
1      3        2        1        Day
2      4        1        1        Week
3      5 1        1        Month

However, the results should be:

ContactID ClientID NumContactsNeeded NumContactsMade TimePeriod
------------- ---------- --------------------------- ------------------------ --------------
1      3        2        1        Day
2      4        1        2        Week
3      5 1        NULL        Month

Since the results of the sub query are:

ClientID Contacts
---------- -----------
3 1
4 2
13 1

What am I doing wrong?

Answer : Update table basxed on results of query

update tempAlias
set NumContactsMade=Contacts
from
(
            SELECT ClientID, SUM(Contacts) AS Contacts
            FROM
                  (
                        SELECT ClientID, COUNT(Client_Contact_Tbl.ClientID) AS Contacts
                        FROM Client_Contact_Tbl
                        GROUP BY ClientID, Contact_Status, ContactDate
                        HAVING Contact_Status IS NOT NULL AND ContactDate >= '6/20/2010'
                  ) a
            GROUP BY a.ClientID
) derivedTable
join @tempContacts tempAlias on derivedTable.ClientId=tempAlias.ClientId

Syntactically that should be correct (although admittedly I think it could be cleaned up to eliminate the derived table). Logically I wonder if your subquery should be grouping on contactid rather than client id, but I suppose if contact and client are 1:1 it won't matter.