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Home -> Community -> Mailing Lists -> Oracle-L -> RE: update year in date column
Barbara,
To be safe, you may want to do something like this. Suppose you have a table called CRTEST with data that looks like: CUSNO CUSNAME CRDATE
1 SMITH 02/21/2099
2 JONES 05/15/2099
3 JOHNSON 08/01/2099
And you know those dates are 1000 years too large.
I'd do this:
UPDATE CRTEST
SET CRDATE = CRDATE - (CRDATE - TO_DATE(TO_CHAR(CRDATE,'MM/DD')||'/'||(TO_CHAR(C
RDATE,'YYYY')-1000)||to_char(crdate,'HH24:MI:SS'),'MM/DD/YYYY HH24:MI:SS'))
Since Oracle does date calculation on days, and years can be somewhat more difficult to precisely define, particularly over a 1,000 years, I wrote the above to force Oracle to do the date arithmetic.
So, what that ugly beast does is it picks apart the date, sets aside the MM/DD portion and the HH24:MI:SS portion, then it subtracts 1000 from the YYYY, and glues it back together, then subtracts that from the original. That gives the difference, and that's what it subtracts from the original.
I think it should work, and it should preserve the timestamps.
Hope that helps,
-Mark
-----Original Message-----
From: Barbara Baker [mailto:barbarabbaker_at_yahoo.com]
Sent: Tuesday, March 23, 2004 3:01 PM
To: oracle-l_at_freelists.org
Subject: update year in date column
OK, I'm just going to bite the bullet and claim total
ignorance here and see if someone takes pity on me :(
(sad face a nice touch, eh?)
Someone has accidently updated 378 records in the customer table. The date changed from 1999 to 2099. I need to change just the year back to 1999 for these records. (I'd like to keep the time stamp, if possible. The month and day are correct.) I looked on metalink, google, and asktom. Some nice examples, but not what I really need.
Thought I'd be clever and subtract 1000 from the date. This works, but I don't know how to get it formatted back into a date.
I'd prefer just sqlplus, but will use pl/sql if necessary.
Here's what I've done so far:
(solaris 9 oracle 9.2.0.4)
JServer Release 9.2.0.4.0 - Production
DOC> CUSNO CUSNAME CRDATE
DOC>---------- ----------------------------------- ---------- DOC> 798489 GILBERT, ROSS 09/16/2099 DOC> 826744 HOEFLER, MATT 10/08/2099 DOC> 795126 FORT, JOETTA09/08/2099
SQL> ---update advdb.custtest_barb SQL> ---set crdate= to_char(crdate,'MM/DD/YYYY')) SQL> ---from customer where cusno=798489; SQL> SQL> select to_date(to_char(crdate,'ddmmyyyy')-1000),'MM/DD/YYYY') 2 from customer where cusno=798489;select
*
SQL> SQL> SQL> --- these both work SQL> select to_char(crdate,'ddmmyyyy') fromcusttest_barb where cusno=798489;
TO_CHAR(
SQL> select to_char(crdate,'ddmmyyyy') - 1000 from custtest_barb where cusno=798489;
TO_CHAR(CRDATE,'DDMMYYYY')-1000
16091099
Thank for any assistance.
Barb
-- Archives are at http://www.freelists.org/archives/oracle-l/ FAQ is at http://www.freelists.org/help/fom-serve/cache/1.html ----------------------------------------------------------------- ---------------------------------------------------------------- Please see the official ORACLE-L FAQ: http://www.orafaq.com ---------------------------------------------------------------- To unsubscribe send email to: oracle-l-request_at_freelists.org put 'unsubscribe' in the subject line. -- Archives are at http://www.freelists.org/archives/oracle-l/ FAQ is at http://www.freelists.org/help/fom-serve/cache/1.html -----------------------------------------------------------------Received on Tue Mar 23 2004 - 15:53:54 CST
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