Function to Substract No of weeks

Hi,
I have a week column called Wk_Value in which i have data from 1990-W01 to 2012-W52.
In one of my filters, I want Wk_value between 2012-W3 to 2011-W28. I want a function where in i can subtract 26 weeks from 2012-W3 so that i can get 2011-W28.
Appreciate your inputs.
Thanks & Regards,
Amrutha.

Amrutha wrote:
Hi,
The datatype is Varchar2.
I am not that aware of the database version. I suppose it is 11g.Jeez, why do people insist on storing dates as strings.
You'll likely have to do some string manipulation to get it converted to a date e.g.
SQL> ed
Wrote file afiedt.buf
1 with t as (select '2012-W03' as dt from dual)
2 select (to_date(substr(dt,1,4),'YYYY')+(7*substr(dt,7,2))) - (7*26)
3* from t
SQL> /
(TO_DATE(SUBSTR(DT,1
24-JUL-2011 00:00:00

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PARAMETERS:fdate LIKE sy-datum DEFAULT '20050103',
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SQL*Plus: Release 11.2.0.2.0 Production on Wed Dec 26 19:13:26 2012
Copyright (c) 1982, 2010, Oracle. All rights reserved.
Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.2.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
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Soph wrote:
Hi Frank,
So 10206, 10207, and 10212 count as both positive and negative? Only positive
Why not just say "I need to substract Transtype 10201 - 10202"? That's what I'm trying to accomplish
Do all the other transtypes mentioned in the WHERE clause (10204, 10210, 10211, 10218 and 10219) count as 0? some of them have count
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33205     1,221,188     1,296,690     108,223     214,256     75,265     183,725     38     1     199     0
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NOT_SENT_NO_TRANSLATE_CME 10212
DUPLICATE 10206
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[quote from wikipedia|http://en.wikipedia.org/wiki/ISO_8601#Week_dates]
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Thanks in advance!
Cheers!
Moderator message: date calculation questions = FAQ, please search before posting.
Edited by: Thomas Zloch on Nov 2, 2010 5:25 PM

Hi,
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