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Re: can I update multiple table at a time?

From: Julius Tuskenis <julius(at)nsoft(dot)lt>
To: Jagadeesh <mnjagadeesh(at)gmail(dot)com>
Cc: pgsql-admin(at)postgresql(dot)org
Subject: Re: can I update multiple table at a time?
Date: 2008-10-10 09:15:29
Message-ID: 48EF1D31.5080207@nsoft.lt (view raw or flat)
Thread:
Lists: pgsql-admin
I don't know a way to edit 2 tables in 1 SQL statement. If you have 2 
sql statements then the performance should be almost the same with the 
function and maybe slightly worse with a trigger.

Jagadeesh rašė:
> Hi Julius Tuskenis,
>
> Many thanks for helping me.  These are good solutions. But I have some
> doubts
> Look below
>
> On Oct 10, 11:06 am, jul(dot)(dot)(dot)(at)nsoft(dot)lt (Julius Tuskenis) wrote:
>
>   
>> I would suggest you 2 solutions:
>>   1. to use a function to edit these fields. That way you will be sure
>> that you will not forget to update both tables.
>>   2. use a trigger on master table. If I understand you - the history
>> table could be filled using trigger, when data in master table changes.
>> That way you could change only master table in your application.
>>
>>     
> I think having triggers would bring performance down. So instead can
> we have single
> sql update statement to update all four fields of  two tables? Just a
> crazy idea.
>
>   
>> Good luck!
>>
>>     
> Thanks for the wish.
> These wishes needed to implement smart solution to above problem :)
>
>   


-- 
Julius Tuskenis
Programavimo skyriaus vadovas
UAB nSoft
mob. +37068233050


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