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Home -> Community -> Mailing Lists -> Oracle-L -> Re: update year in date column
Barb,
First, math on dates (add/subtract) is in days, not years. So if you
use days, you also have to figure out the number of leap days in the
interval. YUCK!
Second, while dates are stored as numbers, they are displayed as
character strings.
So, why not just convert the character string then store it back?
Here is a q&d d&p from my own db.
TO_CHAR(INSERT_DATE
2004/03/22:10:55:54 2004/03/22:10:55:55 2004/03/22:10:55:59 2004/03/22:10:56:00 2004/03/22:10:56:01 2004/03/22:10:56:02 2004/03/22:10:56:03 2004/03/22:10:56:04 2004/03/22:10:56:05 2004/03/22:10:56:06 2004/03/22:10:56:07 2004/03/22:10:56:08 2004/03/22:10:56:09 2004/03/22:10:56:10 2004/03/22:10:56:11 2004/03/22:10:56:12 2004/03/22:10:56:13 2004/03/22:10:56:14 2004/03/22:10:56:15 2004/03/22:10:56:16 2004/03/22:10:56:17
update test_data
set insert_date = to_date('1994'||to_char(insert_date,
'MMDDhh24miss'), 'YYYYMMDDhh24miss')
/
TO_CHAR(INSERT_DATE
1994/03/22:10:55:54 1994/03/22:10:55:55 1994/03/22:10:55:59 1994/03/22:10:56:00 1994/03/22:10:56:01 1994/03/22:10:56:02 1994/03/22:10:56:03 1994/03/22:10:56:04 1994/03/22:10:56:05 1994/03/22:10:56:06 1994/03/22:10:56:07 1994/03/22:10:56:08 1994/03/22:10:56:09 1994/03/22:10:56:10 1994/03/22:10:56:11 1994/03/22:10:56:12 1994/03/22:10:56:13 1994/03/22:10:56:14 1994/03/22:10:56:15 1994/03/22:10:56:16 1994/03/22:10:56:17
You can buy me a round of scotch at Pint's Pub...
Dan
Barbara Baker wrote:
> 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, JOETTA
> 09/08/2099
> DOC>*/
>
> SQL>
> SQL> ---select to_date(to_char(crdate,'MM/DD/YYYY'))
> from customer where cusno=798489;
> 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
> to_date(to_char(crdate,'ddmmyyyy')-1000),'MM/DD/YYYY')
>
> *
> ERROR at line 1:
> ORA-00923: FROM keyword not found where expected
>
> SQL>
> SQL>
> SQL> --- these both work
> SQL> select to_char(crdate,'ddmmyyyy') from
> custtest_barb where cusno=798489;
>
> TO_CHAR(
> --------
> 16092099
>
> SQL> select to_char(crdate,'ddmmyyyy') - 1000 from
> custtest_barb where cusno=798489;
>
> TO_CHAR(CRDATE,'DDMMYYYY')-1000
> -------------------------------
> 16091099
>
> Thank for any assistance.
>
> Barb
>
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