RE: SUM totals by relative appearance in output
Date: Fri, 1 Jul 2011 16:11:44 +0000
Message-ID: <BD475CE0B3EE894DA0CAB36CE2F7DEB40872D71F_at_LITIGMBCRP02.Corp.Acxiom.net>
Just thought I'd share the final query, now that I've "mmoore'ed" it:
DEFINE DISKGROUP=&1
DEFINE DISK_NBR=&2
SELECT disk_nbr, filename, file_nbr, MIN(au_pos) first_au_pos, COUNT(*) cnt
FROM (SELECT disk_nbr, au_pos, filename, file_nbr
, MAX(new_filename_section) OVER (ORDER BY au_pos) max_rn
FROM (SELECT disk_nbr, au_pos, filename, file_nbr
, CASE
WHEN LAG(filename, 1) OVER (ORDER BY au_pos) = filename THEN NULL
ELSE ROW_NUMBER() OVER (ORDER BY au_pos)
END new_filename_section
FROM (SELECT x.number_kfdat disk_nbr
, CASE
WHEN aa.name IS NULL THEN DECODE(x.v_kfdat, 'V', '<Internal>', 'F', '<Free>', '<Unknown>')
ELSE aa.name
END filename
, x.fnum_kfdat file_nbr, x.aunum_kfdat au_pos
FROM x$kfdat x
, v$asm_alias aa
WHERE x.group_kfdat = &DISKGROUP
AND x.number_kfdat = &DISK_NBR
AND ( x.group_kfdat = aa.group_number(+)
AND x.fnum_kfdat = aa.file_number(+))
)
)
)
GROUP BY disk_nbr, filename, file_nbr, max_rn ORDER BY first_au_pos;
DAVID HERRING
DBA
Acxiom Corporation
EML dave.herring_at_acxiom.com 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.
From: Michael Moore [mailto:michaeljmoore_at_gmail.com]
Sent: Friday, July 01, 2011 10:53 AM
To: Herring Dave - dherri
Cc: 'oracle-l_at_freelists.org' (oracle-l_at_freelists.org)
Subject: Re: SUM totals by relative appearance in output
Andy's may be more concise than min. I didn't have much time. ;-) This is what I like to call the "group by change in value" problem.
Mike
On Fri, Jul 1, 2011 at 7:47 AM, Herring Dave - dherri <Dave.Herring_at_acxiom.com> wrote:
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_at_acxiom.com 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. From: Michael Moore [mailto:michaeljmoore_at_gmail.com] Sent: Thursday, June 30, 2011 6:13 PM
To: Herring Dave - dherri
Cc: 'oracle-l_at_freelists.org' (oracle-l_at_freelists.org) 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_at_acxiom.com> 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_at_acxiom.com 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.
-- http://www.freelists.org/webpage/oracle-l -- http://www.freelists.org/webpage/oracle-lReceived on Fri Jul 01 2011 - 11:11:44 CDT