Query with UNION option

Question

Hi ,
I have one partition table.The partitions are created datewise.Now when i have to fire select query on that talble i am firing below querry
Select count(1) from table A where createdate between ('01-JAN-2012 00:00:00','DD-MON-YYYY HH24:MI:SS') AND ('01-JAN-2012 23:59:59','DD-MON-YYYY HH24:MI:SS')
Above query will scan 1 day partition.
now if i want to fetch records from whole month ,it will scan 31 partition one by one.
Select count(1) from table A where createdate between ('01-JAN-2012 00:00:00','DD-MON-YYYY HH24:MI:SS') AND ('31-JAN-2012 23:59:59','DD-MON-YYYY HH24:MI:SS')
Now if i change the query by writing another way which will scan partition parallely.
Select count(1) from table A where createdate between ('01-JAN-2012 00:00:00','DD-MON-YYYY HH24:MI:SS') AND ('01-JAN-2012 23:59:59','DD-MON-YYYY HH24:MI:SS')
union
Select count(1) from table A where createdate between ('02-JAN-2012 00:00:00','DD-MON-YYYY HH24:MI:SS') AND ('02-JAN-2012 23:59:59','DD-MON-YYYY HH24:MI:SS')
union
Select count(1) from table A where createdate between ('03-JAN-2012 00:00:00','DD-MON-YYYY HH24:MI:SS') AND ('03-JAN-2012 23:59:59','DD-MON-YYYY HH24:MI:SS')
union
till
Select count(1) from table A where createdate between ('31-JAN-2012 00:00:00','DD-MON-YYYY HH24:MI:SS') AND ('31-JAN-2012 23:59:59','DD-MON-YYYY HH24:MI:SS')
Is it possible that i can make query by passing different month in above union query .
Month can be dynamic, and above select can be take the values by passing the month.
kindly guide me
=======

Answer 1

I hear you. But can you demonstrate, instead of just telling?
Else, I'll be guessing, that you are just guessing. And I am inclined to guess that your guess is wrong.
But, I could be guessing wrong, of course. (And week-ends I am not online to test it myself)
Start by showing the table, ddl. Is it parallel, noparallel? - And then show the plans for both queries.
And how did you come to that conclusion of "one by one" vs "in parallel"?
Regards
Peter