| From: | David Fetter <david(at)fetter(dot)org> |
|---|---|
| To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | David Salisbury <salisbury(at)globe(dot)gov>, pgsql-general(at)postgresql(dot)org |
| Subject: | Re: exclusive OR possible within a where clause? |
| Date: | 2011-10-14 16:58:37 |
| Message-ID: | 20111014165837.GB32530@fetter.org |
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| Thread: | |
| Lists: | pgsql-general |
On Thu, Oct 13, 2011 at 07:49:59PM -0400, Tom Lane wrote:
> David Salisbury <salisbury(at)globe(dot)gov> writes:
> > Short version, is there a way to implement an exclusive OR in a where clause?
>
> The boolean <> operator will do the trick.
>
> (x = y) <> (a = b)
>
> regards, tom lane
Factoring in NULLable columns, that's:
(x IS NOT DISTINCT FROM y) <> (a IS NOT DISTINCT FROM b)
Cheers,
David.
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