Re: COPY FROM - force a value

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От Demel, Jeff
Тема Re: COPY FROM - force a value
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Msg-id 136ED738BD4F1545B97E4AC06FF6370734C297@DMSP-MSG-EVS01.mail.pvt
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Ответ на COPY FROM - force a value  ("Demel, Jeff" <Jeff.Demel@JavelinDirect.com>)
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That works like a charm.  Thanks, Alvaro!

-Jeff


-----Original Message-----
From: Alvaro Herrera [mailto:alvherre@commandprompt.com]
Sent: Thursday, February 08, 2007 1:22 PM
To: Demel, Jeff
Cc: pgsql-sql@postgresql.org
Subject: Re: [SQL] COPY FROM - force a value

Demel, Jeff wrote:
> Is there a way to force a value when you're doing a COPY FROM,
> importing a file into a table?
>
> Here's my query as it is now:
>
> COPY filetable (value1, value2, value3, value4, forcevalue1,
> forcevalue2)
> FROM 'C:\\InsertFiles\\thisfile.txt'
>   WITH DELIMITER AS '    '
> ;
>
> The file only contains data for values 1 through 4.  I'd like to
> insert values for the last two fields.  This is what I had in mind,
> which doesn't work:
>
> COPY filetable (value1, value2, value3, value4, forcevalue1,
> forcevalue2)
> FROM 'C:\\InsertFiles\\thisfile.txt'
>   WITH DELIMITER AS '    ',
>   forcevalue1 = 1,
>   forcevalue2 = 'this value'
> ;

I'd try setting a DEFAULT for those two columns using ALTER TABLE, then
the COPY FROM call excluding those columns, then removing the DEFAULT.
If you do it in a transaction block, no other transaction can be
molested by the default values, though they will be blocked of the table
during that transaction.

--
Alvaro Herrera
http://www.CommandPrompt.com/
The PostgreSQL Company - Command Prompt, Inc.
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