Re: copying data between tables

On Fri, 27 Feb 2004 20:14:53 +0100, Jean-Michel Chabanne
<jeanmichel.chabanne@online.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?
>>
>>
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>
> 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