How do I return my records grouped by NULL and NOT NULL?

Question

I have a table that has a processed_timestamp column -- if a record has been processed then that field contains the datetime it was processed, otherwise it is null.

Answer 1

Another way in T-sql (sql-server)

select  count(case when t.timestamps is null 
                    then 1 
                    else null end) NULLROWS,
        count(case when t.timestamps is not null 
                    then 1 
                    else null end) NOTNULLROWS
from myTable t