Re: Do FROM items of different schemas conflict?

Tom Lane wrote:
> Okay folks, time to put on your language-lawyer hats ...
> 
> I have been trying to puzzle out the SQL rules concerning whether two
> FROM items conflict in the presence of schemas.  It is entirely clear
> that one is not allowed to write
> 
>     SELECT * FROM tab1, tab1;
> 
> since this introduces two FROM items of the same name in the same scope.
> One *can* write
> 
>     SELECT * FROM tab1, tab1 AS x;
> 
> since the alias x effectively becomes the name of the second FROM item.
> But what about
> 
>     SELECT * FROM schema1.tab1, schema2.tab1;

From my simplistic understanding, I would say if we allowed this, we
would have to require the schema designtation be on every reference to
tab1 in the query.  Is that something we can do?

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