From: Christoph Haller <ch@rodos.fzk.de>
To: intrnl_edu@ilyichevsk.odessa.ua
Cc: pgsql-sql@postgresql.org
Subject: Re: extend INSERT by 'INSERT INTO table FETCH ... FROM cursor' syntax
Date: Mon, 27 Oct 2003 16:39:36 MET
Message-ID: <200310271539.QAA10042@rodos> (raw)
In-Reply-To: <200310240000.00608.intrnl_edu@ilyichevsk.odessa.ua>
>
> Please CC me, I am not subscribed.
>
> An imaginary SQL statement
> INSERT INTO table FETCH ... FROM cursor;
> looks almost the same as currently available
> INSERT INTO table SELECT ...;
>
> I tried it because I needed to insert a row in a table
> after I DELETEd a set of rows, something like this:
>
> 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.
>
> I want to sum up all the money by month, delete all the rows
> (possibly thousands of them) and insert one row per client
> with monthly totals.
>
> Obviously I cannot swap order of INSERT and DELETE here.
>
> I hesitate to post this to pgsql-hackers@postgresql.org,
> do I have to? ;)
>
> --=20
> Alexander Vlasenko
>
Using a temporary table to buffer the result comes to mind.
Regards, Christoph
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Reply to all the recipients using the --to and --cc options:
reply via email
To: pgsql-sql@postgresql.org
Cc: ch@rodos.fzk.de, intrnl_edu@ilyichevsk.odessa.ua
Subject: Re: extend INSERT by 'INSERT INTO table FETCH ... FROM cursor' syntax
In-Reply-To: <200310271539.QAA10042@rodos>
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
This inbox is served by DDX for PostgreSQL; see mirroring instructions
for how to clone and mirror all data and code used for this inbox