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Re: copying data between tables

From: Tsirkin Evgeny <tsurkin(at)mail(dot)jct(dot)ac(dot)il>
To: Jean-Michel Chabanne <jeanmichel(dot)chabanne(at)online(dot)fr>
Cc: Postgres Admin List <pgsql-admin(at)postgresql(dot)org>
Subject: Re: copying data between tables
Date: 2004-02-28 12:18:45
Message-ID: opr32xtjgajbdarf@localhost (view raw or flat)
Thread:
Lists: pgsql-admin
On Fri, 27 Feb 2004 20:14:53 +0100, Jean-Michel Chabanne 
<jeanmichel(dot)chabanne(at)online(dot)fr> wrote:

> Le ven 27/02/2004 ׳� 03:40, Tsirkin Evgeny a ׳™crit :
>> Hi all!
>> I have the following task :
>> I have some tables edited (insert/update) by users.
>> I should create a file (in whatever format) containing
>> changes of the last day,every day.What I have currently
>> is :
>> I have two tables of the same structer ,every day i :
>>
>> select * from newtable
>> except
>> select * from oldtable
>>
>> And then format the data with perl script.After that ,i
>> am copying the data from the new table to the old table .It
>> works pretty good except that the copying is VERY slow:
>> I use :
>> insert into old from (select * from newtable);
>>
>> Is there any more afficient way to do what i need ,
>> that somebody already use?
>> Is there any more afficient way to copy data between
>> tables?
>> I know that i can use COPY to copy files from
>> and to files ,can it be used here?
>>
>>
>> ---------------------------(end of broadcast)---------------------------
>> TIP 5: Have you checked our extensive FAQ?
>>
>>                http://www.postgresql.org/docs/faqs/FAQ.html
>>
>
> If I had to do this, I would use triggers which, on every INSERT/UPDATE
> by users, would insert the new item + timestamp or date in a new table.
>
> I hope this will help you.
>
>
That would not make me able to know WHAT was the change:
what was there befor and after the update




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