MAX DATE With NULL VALUE Trying to get the max date from my table, i can't retrieve the value when the date is null. 
Sample : 

the following table : 

+----+--------+------+------------------------+
| id | parent |    Date                       |
+----+--------+------+------------------------+
|  1 | Alex   |   2018-10-01 00:00:00.0000000 |
|  1 | TIM    |   2012-11-07 00:00:00.0000000 |
|  3 | Cath   |    NULL                       |
+----+--------+------+------------------------+


To get the max date im using the following:

select id, Parent, Date From Table T1
Where Date = (select Max(Date) from Table T2 where T1.id= T2.id )


Wich works fine for the id = 1
But for the id = 3 it's not working 

The result is :

1 | Alex   |   2018-10-01 00:00:00.0000000


Any ideas Why?
Aggregated functions does not consider rows with NULL values.

You could use a WINDOW FUNCTION to enumerate rows and then get first row only:

with ct as
(
    select id, Parent, Date,
           row_number() over (partition by id order by id, date desc) rn
    from   tbl
)
select id, Parent, Date
from   ct
where  rn = 1
order by id;

id | Parent | Date               
-: | :----- | :------------------
 1 | Alex   | 01/10/2018 00:00:00
 3 | Cath   | null              


db&lt;>fiddle here