Advice with a query to find Accounts with activities within a given period ONLY

Question

Hello there,
I am relatively new to Microsoft T-SQL and I was wondering if someone could help shed some light into a requirement I got...
I have two tables in a database. One with accounts, and another with activities for such accounts. He is a simple diagram:
*NOTE: Dates are in the DD/MM/YYYY format.
Here is what I need to do:
I need to get a list of all the accounts where the LAST activity was created in a date range, along with a count of activities that fall in such range. The idea behind this is to find out accounts with no activity after a certain period.
I can certainly accounts with activities in a given range -- but that does not mean that there was no activities after the range.
For example, if I look for Accounts with activities between Feb/2014 and Mar/2014, this query should NOT return the Contoso account, because it ha an activity after Mar/2014 (i.e.: Meeting with John on 15/Apr/14).
Another example: If I query accounts with activities from 01/Jan/2014 and 03/Apr/2014, it should ONLY return the Adventureworks account:
Adventureworks (3)
[the number in parenthesis is the count of activities in that given time]
This is because all other accounts had activities after 03/Apr/2014.
Could someone please advise the best way to construct this query?
Thanks in advance for the help!
Regards,
P.

Answer 1

SELECT * FROM tbl WHERE CreatiinDate BETWEEN @firstactivities AND  lastactivites
AND NOT EXISTS 
(SELECT * FROM tbl t WHERE CreatiinDate>=@lastactivites
AND
tbl.AccountID=T.AccountID )
OR
SELECT * FROM tbl WHERE
AccountID  NOT IN (SELECT
AccountID FROM
tbl t WHERE CreatiinDate>@lastactivites) 
AND CreationDate BETWEEN
@firstactivities AND  lastactivites
Best Regards,Uri Dimant SQL Server MVP,
http://sqlblog.com/blogs/uri_dimant/
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