Re: Bulk Insert / Update / Delete - Mailing list pgsql-general

Hi Jason

Thanks for your prompt response.

I'm pretty new to SQL, so please excuse the following rather stupid question
:

How do I use the (NOT) EXISTS or (NOT) IN clause ? Would it be feasible,
using your suggestion, to simply put in two SQL statements, in the same
query - first UPDATE when EXISTS, then INSERT when NOT EXISTS, to accomplist
this in one go ?

Regards

Phil

----- Original Message -----
From: Jason Godden <jasongodden@optushome.com.au>
To: Philip Boonzaaier <phil@cks.co.za>; <pgsql-general@postgresql.org>
Sent: Tuesday, August 19, 2003 4:42 PM
Subject: Re: [GENERAL] Bulk Insert / Update / Delete


Hi Philip,

Pg is more ansi compliant than most (GoodThing (TM)).  You can use the
'when'
conditional but not to do what you need.  If I understand you correclty you
should be able to acheive the same result using two seperate queries and the
(NOT) EXISTS or (NOT) IN clause.  Failing that have a look at the fine docs
on pl/pgsql and other postgresql procedural languages which allow you to use
loops and conditional statements like 'if'.

Rgds,

J

On Wed, 20 Aug 2003 12:21 pm, Philip Boonzaaier wrote:
> I want to be able to generate SQL statements that will go through a list
of
> data, effectively row by row, enquire on the database if this exists in
the
> selected table- If it exists, then the colums must be UPDATED, if not,
they
> must be INSERTED.
>
> Logically then, I would like to SELECT * FROM <TABLE>
> WHERE ....<Values entered here>, and then IF FOUND
> UPDATE <TABLE> SET .... <Values entered here> ELSE
> INSERT INTO <TABLE> VALUES <Values entered here>
> END IF;
>
> The IF statement gets rejected by the parser. So it would appear that
> PostgreSQL does not support an IF in this type of query, or maybe not at
> all.
>
> Does anyone have any suggestions as to how I can achieve this ?
>
>
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This message is privileged and confidential and intended for the addressee only. If you are not the intended recipient
youmay not disclose, copy or 
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destroythe original message 
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