RE: more sql
Date: Wed, 12 Mar 2008 13:57:16 -0500
Message-ID: <7070047601C21A4CB387D50AD3661F6E093E9015@050EXCHANGE.research.na.admworld.com>
Ahh. I believe I found the answer to my own question with portioned
outer joins.
chris
From: oracle-l-bounce_at_freelists.org
[mailto:oracle-l-bounce_at_freelists.org] On Behalf Of Stephens, Chris
Sent: Wednesday, March 12, 2008 12:10 PM
To: Oracle-L Freelists
Subject: more sql
I have learned a lot about sql this morning but I can't quite close the gap between what I am reading and what I need to do. I know the following query can be written far more efficiently:
select pstart.periodID, ps1.projectNumber, ps1.statusID, ps1.changeDate
from vw_project_status_period ps1,
period pstart,
period pstop
where pstart.periodid >= ps1.periodid and
pstop.endDate = ( select max( p.endDate )
from
vw_project_status_period ps2,
period p
where
ps2.projectnumber = ps1.projectNumber and
ps2.periodid = p.periodid and p.endDate <= pstart.endDate
) and
pstop.periodid = ps1.periodid;
vw_project_status_period contains info on when a projects status changes. The above query fills in period gaps between changes for each project. I am having trouble figuring out how to 'fill in the gaps' of periods between the change dates. After that it is just a matter of using last_value.
I have been looking at this for a few hours and figured I'd throw another sql question to the list.
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