| From: | Richard Broersma <richard(dot)broersma(at)gmail(dot)com> |
|---|---|
| To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | sql pgsql <pgsql-sql(at)postgresql(dot)org> |
| Subject: | Re: Learning about WITH RECURSIVE |
| Date: | 2009-11-04 22:17:00 |
| Message-ID: | 396486430911041417o40cf1939k6ff703ca704a3e14@mail.gmail.com |
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| Lists: | pgsql-sql |
On Wed, Nov 4, 2009 at 2:11 PM, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
> Richard Broersma <richard(dot)broersma(at)gmail(dot)com> writes:
>> Can anyone one explain why a "WITH RECURSIVE" query has the same
>> results regardless whether UNION or UNION ALL is specified?
>
> Well, if the rows are all different anyway, UNION isn't going to
> eliminate any ...
Okay thanks. I see that I need to spend more time with the on-line docs.
--
Regards,
Richard Broersma Jr.
Visit the Los Angeles PostgreSQL Users Group (LAPUG)
http://pugs.postgresql.org/lapug
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