select in some range , but finishdate on table B

[sql]

I need to get rang of University head count

select  A.UniversityN, count(*)
from Post
and UpdateId like'U%'
group  BY UniversityN and ReceiveDate>='2010-01-01' and ApprovalDate<=''2010-02-02';

but the problem is the ApprovalDate on table B , and table Post and table Post is one to many relationship , ther connected By UserId .
any ideal??
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Yamaha Dt250