RE: SUM totals by relative appearance in output
- From: Herring Dave - dherri <Dave.Herring@xxxxxxxxxx>
- To: Michael Moore <michaeljmoore@xxxxxxxxx>
- Date: Fri, 1 Jul 2011 14:47:39 +0000
Excellent, Michael!! Initial tests show this is what I'm looking for, based on
a 10-row table. Now onto 100K's per disk. I haven't tested Andy's suggestion,
but may get to it tomorrow.
BTW Brandon, you were correct - a LAG function was needed in the query. :-)
DAVID HERRING
DBA
Acxiom Corporation
EML dave.herring@xxxxxxxxxx
TEL 630.944.4762
MBL 630.430.5988
1501 Opus Pl, Downers Grove, IL 60515, USA
WWW.ACXIOM.COM
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From: Michael Moore [mailto:michaeljmoore@xxxxxxxxx]
Sent: Thursday, June 30, 2011 6:13 PM
To: Herring Dave - dherri
Cc: 'oracle-l@xxxxxxxxxxxxx' (oracle-l@xxxxxxxxxxxxx)
Subject: Re: SUM totals by relative appearance in output
SELECT MIN (dt) imin,count(*) cnt, st
FROM (SELECT dt, st, MAX (rn) OVER (ORDER BY dt) max_rn
FROM (SELECT dt,
st,
CASE
WHEN LAG (st, 1) OVER (ORDER BY dt) = st
THEN NULL
ELSE ROW_NUMBER () OVER (ORDER BY dt)
END
rn
FROM k2))
GROUP BY st, max_rn
ORDER BY 1;
where st is filename, dt is starting,
Mike
On Thu, Jun 30, 2011 at 3:11 PM, Herring Dave - dherri
<Dave.Herring@xxxxxxxxxx> wrote:
Folks,
I'm having a bit of a mental block dealing with a query I'm trying to write.
What I'd like to do is for data in a table, ordered by some value when
queried, to only display totals when rows are repeating by a value, but only
doing this totalling by their relative position in the output. (I'm sure
there's a better way to say that, but right now even that's beyond my scope.)
Let's say I was trying to map out relative position of files in ASM by their AU
position. FILE1 could have 1-to-many consecutive AUs, then another file or
free space, then FILE1 could repeat. For example:
FILE NAME AU POS
--------- ------
FILE1 1
FILE1 2
FILE2 3
FILE3 4
FILE3 5
FILE3 6
FILE1 7
...
For the above data I'd want to see:
FILE NAME STARTING AU POS LENGTH
--------- --------------- ------
FILE1 1 2
FILE2 3 1
FILE3 4 3
FILE1 7 1
...
I'm convinced I can use an analytic function with the right windowing option to
do this all in SQL, but so far I've failed miserably. Obviously I could write
PL/SQL to do this, but I've overflown DBMS_OUTPUT's capacity and ended up
moving on to capturing output and manipulating it with perl. But that seems
like a waste because again, I'm convinced I can do this in SQL without forcing
a fork onto something else.
Does any of this make sense and does anyone have a way to do this with SQL?
DAVID HERRING
DBA
Acxiom Corporation
EML dave.herring@xxxxxxxxxx
TEL 630.944.4762
MBL 630.430.5988
1501 Opus Pl, Downers Grove, IL 60515, USA
WWW.ACXIOM.COM
The information contained in this communication is confidential, is intended
only for the use of the recipient named above, and may be legally privileged.
If the reader of this message is not the intended recipient, you are hereby
notified that any dissemination, distribution or copying of this communication
is strictly prohibited. If you have received this communication in error,
please resend this communication to the sender and delete the original message
or any copy of it from your computer system. Thank you.
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