Re: Proposal for supporting outer joins in 7.1

At 11:38 27/08/00 -0400, Tom Lane wrote:
>Philip Warner <pjw@rhyme.com.au> writes:
>>> SELECT ... FROM (a cross join b) cross join c
>> I'm not sure whether the above is the syntax you plan to use, but it looks
>> a little too much like:
>> SELECT ... FROM (select * from a cross join b) as z cross join c
>> which has a quite different meaning to any kind of outer join,
>
>Huh?  AFAIK they mean exactly the same thing, modulo a few issues about
>visibility of columns.  In any case you'll have to take your complaint
>to ISO, because that's what the spec says the syntaxes are.

Sorry, I should have written:
   SELECT ... FROM (select * from a,b) as z, c

which does not do an outer join, and does not imply any ordering.


>> I don;t think that support for this kind of query is implemented,
>
>Not yet, but it's certainly on the TODO list.  I'm not seriously
>thinking about getting subselect-in-FROM done in this go-round,
>though.

Great! If by Subselect-in-from you mean something like what I wrote above,
then it is a major win.


----------------------------------------------------------------
Philip Warner                    |     __---_____
Albatross Consulting Pty. Ltd.   |----/       -  \
(A.B.N. 75 008 659 498)          |          /(@)   ______---_
Tel: (+61) 0500 83 82 81         |                 _________  \
Fax: (+61) 0500 83 82 82         |                 ___________ |
Http://www.rhyme.com.au          |                /           \|                                |    --________--
PGP key available upon request,  |  /
and from pgp5.ai.mit.edu:11371   |/