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External Table with Sequence number [message #242635]

Mon, 04 June 2007 08:28

yamon
Messages: 22
Registered: July 2006

Junior Member

Is it possible to create a Oracle generated Sequence Number when using an External Table? In SQL Loader, I would use the SEQUENCE (MAX,1) statement to generate a sequence number, or SEQ.nextval when using DML, but I cannot find any documentation on using this with an External Table. Any help is much appreciated.

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Re: External Table with Sequence number [message #242644 is a reply to message #242635]

Mon, 04 June 2007 09:08

Michel Cadot
Messages: 68767
Registered: March 2007
Location: Saint-Maur, France, https...

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Don't multipost.

Regards
Michel

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Re: External Table with Sequence number [message #242646 is a reply to message #242635]

Mon, 04 June 2007 09:22

Michel Cadot
Messages: 68767
Registered: March 2007
Location: Saint-Maur, France, https...

Senior Member
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You can't use it and it is meaningless.
External tables are not definitive place of data.
They are just staging area.
You generate your value (sequence or other) when you put the data in the definitive place.

For instance:
insert into final_table select rownum, t.* from external_table t;

Regards
Michel

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Re: External Table with Sequence number [message #242673 is a reply to message #242646]

Mon, 04 June 2007 11:29

yamon
Messages: 22
Registered: July 2006

Junior Member

Thank you Michel. I was unsure if the INSERT INTO table...FROM external_table would always insert in the correct line number order. Thanks for your advice.

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Re: External Table with Sequence number [message #242685 is a reply to message #242673]

Mon, 04 June 2007 12:04

Michel Cadot
Messages: 68767
Registered: March 2007
Location: Saint-Maur, France, https...

Senior Member
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If you want a specific order then add an "order by" clause.

Regards
Michel

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