On Saturday, October 13, 2018, Bruce Momjian &lt;<a href="mailto:bruce@momjian.us">bruce@momjian.us</a>&gt; wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">On Sat, Oct 13, 2018 at 12:25:38PM +0300, KES wrote:<br>
&gt; &gt;or NULL if any of the comparisons result in unknown<br>
&gt; result in unknown??<br>
<br>
Well, SQL has a three-valued logic, and UNKOWN values are treated like<br>
NULL.  For me they have always been the same, and I would like to avoid<br>
&quot;unknown&quot; in this context, if possible.<br><br>
</blockquote><div><br></div><div>I was just trying to avoid using the word null twice in the same sentence but it’s not a strong aversion.</div><div><br></div><div>David J.</div><div><br></div>