Re: extend INSERT by 'INSERT INTO table FETCH ... FROM cursor' syntax

From: Josh Berkus <josh(at)agliodbs(dot)com>
To: Christoph Haller <ch(at)rodos(dot)fzk(dot)de>, intrnl_edu(at)ilyichevsk(dot)odessa(dot)ua
Cc: pgsql-sql(at)postgresql(dot)org
Subject: Re: extend INSERT by 'INSERT INTO table FETCH ... FROM cursor' syntax
Date: 2003-10-27 19:35:58
Message-ID: 200310271135.59460.josh@agliodbs.com
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Alexander,

> > BEGIN;
> > DECLARE total CURSOR
> > FOR SELECT=20
> > SUBSTR(datetime,1,7)||'-01 00:00:00' as month,
> > client,
> > SUM(money)
> > FROM stat
> > WHERE SUBSTR(datetime,1,7)=3D'2003-10'
> > GROUP BY month,client;
> > DELETE FROM stat WHERE SUBSTR(datetime,1,7)=3D'2003-10';
> > INSERT INTO stat FETCH ALL FROM total;
> > COMMIT;
> >
> > but it does not work, chokes on FETCH ALL.

Well, there's two problems with your program:

1) INSERT INTO .... FETCH ALL is not currently implemented. You would need to
use a loop, and insert one row at a time by value.

2) You can't insert the rows you've just deleted from the base tables. In
your example, the TOTAL cursor would be empty. I think that what you really
want is a temp table.

--
-Josh Berkus
Aglio Database Solutions
San Francisco

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