Filter by Sum without Grouping

Question

i have a resultset that i generate from a query that Looks like this:
  Select Employee, Month,
(select case
when Status = '---'
then 0 Else
1 end) as PlaningValue     
  From   PlanningTable PT
  Where  Month >=
@From Month and Month
<= @ToMonth
The Result of this Looks something like this:
|Employee| Month   
| PlaningValue |
|George    |2014-01 
|                
1 |
|George    |
2014-02 |                
1 |
|George    |
2014-03 |                 0
|
|Andrew    |
2014-01 |               
0 |
|Andrew    |
2014-02 |               
1 |
|Andrew    |
2014-03 |               
0 |
|Howard    |
2014-01 |               
1 |
|Howard    |
2014-02 |               
1 |
|Howard    |
2014-03 |                1
|
Now what i want is the following:
Filter out Employee's who, over the three month period, have a total planing Value of 3, in the example above, Howard would be filtered out.
Is there a way to do this nicely or is it all just impossible to even thin ?
(Remark: Since i am going to use the Query on Reporting Services, i can't use the OVER function)
Thank you all for your help

Answer 1

Jingyang's answer is a top choice, assuming SQL Server 2005 or greater (you didn't say what version, everybody should!).  I wrote up a version doing the same thing before I noticed Jinyang's answer already was here.  The last item in the list is
a derived query version, same net effect as using the WITH statement.
Create_Demo_table:
Declare @Demo Table (employee varchar(99), month varchar(77), status int)
Insert @Demo
Select 'George', '2014-01 ', 1
UNION ALL Select 'George', '2014-02', 1
UNION ALL Select 'George', '2014-03', 0
UNION ALL Select 'Andrew', '2014-01', 0
UNION ALL Select 'Andrew', '2014-02', 1
UNION ALL Select 'Andrew', '2014-03', 0
UNION ALL Select 'Howard', '2014-01', 1
UNION ALL Select 'Howard', '2014-02', 1
UNION ALL Select 'Howard', '2014-03', 1
With_Stmt:
;With X as
Select *
, sum(status) over(partition by employee) as sumStat
from @Demo
where month between '2014-01' and '2014-03'
Select * from X where SumStat < 3
Derived_query:
Select * from
Select *
, sum(status) over(partition by employee) as sumStat
from @Demo
where month between '2014-01' and '2014-03'
) Derived1
where Sumstat < 3