Outer join with where clause in the universe

Question

Hi,
I have two tables such as:
Patient Table (P)                          Territory Table (T)
P. Alignment ID --------------------------   T.Alignment ID
P. Patient ID                                    T. Region
Two tables are joined on alignment ID, follow is how the data looks like
When i run the query only on Patient Table  i get the following
e.g.
Select P.Patient ID, P.Alignment ID
from Patient Table (P)
Where P.Data_date=P.Latest data date
----Note that there is a Where clause here always & i get the following result
P.Patient ID         P.Alignment ID      
    1                            1a
    2                             2a
    3                            3a
    4                            Null
    5                            Null
Now when i join two tables on Alignment ID
e.g.
Select P.Patient ID, P.Alignment ID,T.Region
from Patient Table (P)
LEFT OUTER  JOIN Territory Table (T)
ON P. Alignment ID =  T.Alignment ID
Where P.Data_date=P.Latest data date
AND T.Data_date=T.Latest data date
Following is the result:
P.Patient ID         P.Alignment ID      
    1                            1a
    2                            2a
    3                            3a
Even with the left outer join it is not brining in the Null values , it seems that because of the WHERE clause the LEFT OUTER is working as a INNER join.
How can i get the Null rows with my join to the territory table ?
Please Advise,
Thanks,
Sheikh

Answer 1

its not letting me atatched the excel extract but the data is simple as i shown above e.g.
Patient Table (P)                          Territory Table (T)
P. Alignment ID --------------------------   T.Alignment ID
P. Patient ID                                    T. Region
Two tables are joined on alignment ID, follow is how the data looks like
When i run the query only on Patient Table  i get the following
e.g.
Select P.Patient ID, P.Alignment ID
from Patient Table (P)
Where P.Data_date='01-OCT-2014'
----Note that there is a Where clause here always & i get the following result
P.Patient ID         P.Alignment ID      
    1                            1a
    2                             2a
    3                            3a
    4                            Null
    5                            Null
Now when i join two tables on Alignment ID
e.g.
Select P.Patient ID, P.Alignment ID,T.Region
from Patient Table (P)
LEFT OUTER  JOIN Territory Table (T)
ON P. Alignment ID =  T.Alignment ID
Where P.Data_date='01-OCT-2014'
AND T.Data_date='01-OCT-2014'
Following is the result:
P.Patient ID         P.Alignment ID      
    1                            1a
    2                            2a
    3                            3a
Now the whole issue is that the condition in the WHERE clause is making it act like a inner join and iw ant the NULL rows to appear
Sheikh