Help with a union all statement

Question

Hello
I am pulling a query much like this:
(select ID, Created_timestamp from snapshot1
where created_timestamp >= to_date ('8/15/2007 12:00:00 AM','MM/DD/YYYY HH:MI:SS AM')
and created_timestamp < to_date('8/18/2007 12:00:00 AM','MM/DD/YYYY HH:MI:SS AM'))
UNION ALL
(select ID, created_timestamp from snapshot2
where created_timestamp >= to_date ('8/15/2007 12:00:00 AM','MM/DD/YYYY HH:MI:SS AM')
and created_timestamp < to_date('8/18/2007 12:00:00 AM','MM/DD/YYYY HH:MI:SS AM'))
UNION ALL
(select ID, created_timestamp from data_history
where created_timestamp >= to_date ('8/15/2007 12:00:00 AM','MM/DD/YYYY HH:MI:SS AM')
and created_timestamp < to_date('8/18/2007 12:00:00 AM','MM/DD/YYYY HH:MI:SS AM'))
Is there an easier way to handle created_timestamp?
I would like to put it at the beginning so I only have to change it in one place.

Answer 1

I don't understand.
I try your with statement and get: "end_date" invalid identifier as an error
I start my query out:
WITH start_date as
(select to_date ('08/15/2007 12:00:00 AM','MM/DD/YYYY HH:MI:SS AM') from dual),
end_date as (select to_date ('08/18/2007 12:00:00 AM','MM/DD/YYYY HH:MI:SS AM) from dual)
select sales.id, start_date as callstart, end_date as callend
where sales.created_timestamp >= start_date
and sales.created_timestamp < end_date
UNION ALL
<<<<<<<here is where you take the last select statement and replace sales with manufacturing>>>>>>>>>>>>>
UNION ALL
<<<<<<<here is where you take the last select statement and replace sales with engineering>>>>>>>>>>>>>
and it still fails.