RE: SUM totals by relative appearance in output
- From: "Weiss, Andy" <Andy.Weiss@xxxxxxxxxxxxxxx>
- To: "Dave.Herring@xxxxxxxxxx" <Dave.Herring@xxxxxxxxxx>, "'oracle-l@xxxxxxxxxxxxx' (oracle-l@xxxxxxxxxxxxx)" <oracle-l@xxxxxxxxxxxxx>
- Date: Thu, 30 Jun 2011 16:51:17 -0700
Would this work?
select file_name, min(au_pos), count(*)
from (select file_name,
au_pos,
au_pos-rank() over (partition by file_name order by au_pos)
grp_ind
from tst2)
group by grp_ind, filename;
FILE_NAME MIN(AU_POS) COUNT(*)
---------- ----------- ----------
FILE 1 7 1
FILE 1 1 2
FILE 2 3 1
FILE 3 4 3
SQL> desc tst2
Name Null? Type
----------------------------------------- -------- ----------------------------
FILE_NAME VARCHAR2(10)
AU_POS NUMBER
SQL> select * from tst2;
FILE_NAME AU_POS
---------- ----------
FILE 1 1
FILE 1 2
FILE 2 3
FILE 3 4
FILE 3 5
FILE 3 6
FILE 1 7
- Andy
-----Original Message-----
From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx] On
Behalf Of Herring Dave - dherri
Sent: Thursday, June 30, 2011 3:11 PM
To: 'oracle-l@xxxxxxxxxxxxx' (oracle-l@xxxxxxxxxxxxx)
Subject: SUM totals by relative appearance in output
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
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