Re: is it possible to do an update with a nested select that references the outer update ?

On 6 Oct 2009, at 18:57, Jonathan Vanasco wrote:

> i think this attempt most clearly expresses what I was trying to do
>
> 	UPDATE table_a a set id_field = ( SELECT id_field FROM table_b b  
> WHERE a.first_name || ' ' || b.last_name = a.fullname ) WHERE  
> id_field IS NULL ;
>
> I'd be greatful if anyone has a pointer


You're looking for UPDATE FROM:

UPDATE table_a SET id_field = table_b.id_field FROM table_b WHERE  
table_a.firstname || ' ' || table_b.last_name = table_a.fullname AND  
table_a.id_field IS NULL;

Apparently table_a.id_field is not a primary key? Seems a bit weird to  
me, but if it floats your boat...

Alban Hertroys

--
Screwing up is the best way to attach something to the ceiling.


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