Re: exclusive OR possible within a where clause?

On Thu, Oct 13, 2011 at 07:49:59PM -0400, Tom Lane wrote:
> David Salisbury <salisbury@globe.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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