Query on use of sequences.

This question was already posted in another forum wrongly. Just duplicating here to get more responses.
Is it a bad practice for a DB to have the primary key populated from a sequence(using SEQ.nextval expression)?
Update:
==============================
The other link: Oracle Sequences
Edited by: 937791 on Jun 29, 2012 11:14 PM

>
Hi, (maybe you should provide the link to the other forum so that we
can see what's already been said)
Is it a bad practice for a DB to have the primary key populated from a
sequence(using SEQ.nextval expression)?Absolutely not. There is a "holy war" about whether it is better to
have "natural" keys or synthetic ones. That war is essentially over,
the synthetic (or to use your terminology an arbitrary "sequence")
key having won.
IMHO, the (vast?) majority of Oracle databases (and all the other RDBMSs) use
sequences (or Identity or Autonumber or whatever) i.e. synthetic keys.
See here for some notes (basic) about db design: http://www.kudzuworld.com/articles/DBDesign/index.en.aspx
and here for note on Oracle (compared with other RDBMSs): http://www.orafaq.com/wiki/AutoNumber_and_Identity_columns
HTH,
Paul...

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PP guru
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EDIT
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create or replace
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Edited by: user9371286 on 31.Tem.2010 04:15
Edited by: user9371286 on 31.Tem.2010 04:21
Edited by: user9371286 on 31.Tem.2010 04:27

Please post your trigger code and your database version ( the result of: select * from v$version; ).
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(see: http://forums.oracle.com/forums/help.jspa for more examples regarding tags)
"PLS-00357: Table,View Or Sequence reference "string" not allowed in this context
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+http://download.oracle.com/docs/cd/B19306_01/server.102/b14219/plsus.htm#sthref13592+
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http://download.oracle.com/docs/cd/B19306_01/appdev.102/b14251/adfns_triggers.htm#ABC1032282

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Thank you very much for your reply. I think I'm getting closer to the solution. Just I got an error message
"date format not recognized"
when I add "to_char( call_date, 'mmm-yy' )" to the query string. I tried using all uppercase, but that did not make a difference. Do I need to use to_date inside the to_char maybe?
to_char(to_date(call_date, 'mmm/yy'), 'mmm-yy')
Thanks again for your help.
Rich

Use of Sequence in Match-Merge

Dear All,
I have a source table containing name and address data. I want to do householding, which means I need to split the data using a match-merge operator. The address data is the merged output, and the name data is the cross-reference output. All well and good so far.
I want eventually to load the outputs into two levels of a Customer dimension (although for testing right now, I'm just using two ordinary target tables). I know that I will need a 'business key' to link the merged and the cross-reference outputs (as the two dimensional levels). I decide that I shall create a column in both outputs called HH_SEQ, and load this Household Sequence number from a Sequence (which I prepared earlier).
In Merge Rules, for the Attribute HH_SEQ, I use a Rule Type of Sequence, and select the appropriate Sequence from the drop-down list box. I map this attribute in the MERGE outgroup to the appropriate column in the target merged table, and MM_HH_SEQ in the XREF outgroup to the appropriate column in the target cross-reference table.
Here is the issue: to get HH_SEQ to be available as a potential Output Attribute in either Merge Output or Cross-Reference Output, it must first be present as a Source Attribute. Which means I had to add it to Input Attributes first. But of course it is not on my input source table! And thus I get a "VLD-1000 Input parameter INGRP1.HH_SEQ does not have input" warning.
Either I'm just not understanding how to use the Sequence rule type properly (the documentation is pretty atrocious, mind), or there is some technique required here that is just not apparent from several days of experimentation.
All help gratefully received!
Regards,
Donna
p.s. it does actually compile and run just fine!

Hi Donna
I think you are using it in the correct way! I've seen other examples like this from the MM creators.
The warning can be ignored, I think it is there to highlight a potential issue if it was being used for a scenario other than what you are doing.
Cheers
David

Query on use of sequences.

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