Re: question about visibilty while updating multiple rows .

On Wednesday 09 Apr 2003 8:42 pm, Tom Lane wrote:
> > If an update statement is affecting multiple rows of a table X ,
> > Does a subselect (selecting from X only)  inside EXISTS part of outer
> > query able to see the changes when rows are being updated one by one by
> > outer query?
>
> No, because it's part of the same query.
>
> I believe though that a user-defined function called from the update
> query would see the changes made so far.  So possibly you can fix your
> problem by pushing the EXISTS down into a SQL or plpgsql function.

Thanks for the explanation and suggestion Tom,
I did it however by using intermediate tables and distinct on().

Regds
Mallah.


>
>             regards, tom lane
>
>
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