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Home -> Community -> Mailing Lists -> Oracle-L -> Re: Renumber a set of grupped rows?
Hi Maryann,
I can do this easily when creating a new table using:
create table new_table as
select emp_id,
row_number() over (partition by emp_id order by rec_id) as rec_id from original_table;
Translating this into an update statement is probably a bit awkward for me - I'd just create a new table and do some renaming (as long as that's a viable option for you). If not, hopefully someone will explain how this could be constructed as a single update statement.
Regards,
Mark.
PS: Otherwise, if you are on Oracle 9 you could create some anonymous pl/sql using the above statement as a cursor but include the rowid as a field. Loop through the cursor, updating rec_id where rowid = cursor.rowid. Unfortunately this won't work easily on Oracle 8 since the PL/SQL engine doesn't know about analytical functions - you'd have to add another layer of complexity (probably a temporary table).
Maryann Atkinson
<maryann_30_at_yahoo To: Multiple recipients of list ORACLE-L <ORACLE-L_at_fatcity.com>
.com> cc:
Sent by: Subject: Renumber a set of grupped rows?
ml-errors_at_fatcity
.com
21/01/2004 09:24
Please respond to
ORACLE-L
I have a 10000-rows table with 2 columns, Emp_ID and Req_ID.
There are about 150 different emp_ids in these 10000+ records.
What I want to do is the following:
For every different Emp_id, I need the Rec_ids that corresponds to it to be updated/renumbered starting from 1 and keep going up by 1.
So I want it to look something like this:
Emp_ID Req_ID
10001 001 10001 002 10001 003 10001 004 10001 005 10001 006 10001 007 10001 008 10002 001 10002 002 10002 003 10002 004 10002 005 10003 001 10004 001 10004 002 10004 003 10004 004 10004 005 10004 006
etc
Any ideas?
Thanks,
maa
-- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: Maryann Atkinson INET: maryann_30_at_yahoo.com Fat City Network Services -- 858-538-5051 http://www.fatcity.com San Diego, California -- Mailing list and web hosting services --------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).Received on Tue Jan 20 2004 - 16:49:26 CST
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-- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: Mark Richard INET: mrichard_at_transurban.com.au Fat City Network Services -- 858-538-5051 http://www.fatcity.com San Diego, California -- Mailing list and web hosting services --------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
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