Fix for docs from Patrick Welche:

bmomjian · bmomjian · commit 5c1dc0280e50 · 2002-03-15T15:55:58.000Z
! 	DIFFERENCE (&amp;minus; or &amp;setmn;): builds the set difference of
  	two tables. Let &lt;classname&gt;R&lt;/classname&gt; and
&lt;classname&gt;S&lt;/classname&gt;
again be two tables with the same
  	arity. &lt;classname&gt;R&lt;/classname&gt; - &lt;classname&gt;S&lt;/classname&gt;
--- 488,494 ----

        &lt;listitem&gt;
        &lt;para&gt;
! 	EXCEPT (&amp;minus; or &amp;setmn;): builds the set difference of
diff --git a/doc/src/sgml/sql.sgml b/doc/src/sgml/sql.sgml
@@ -1,5 +1,5 @@
 <!--
-$Header: /cvsroot/pgsql/doc/src/sgml/sql.sgml,v 1.24 2001/10/23 16:42:36 momjian Exp $
+$Header: /cvsroot/pgsql/doc/src/sgml/sql.sgml,v 1.25 2002/03/15 15:55:58 momjian Exp $
 -->
 
  <chapter id="sql">
@@ -488,7 +488,7 @@ attributes are taken from. We often write a relation scheme as
 
       <listitem>
        <para>
-	DIFFERENCE (&minus; or &setmn;): builds the set difference of
+	EXCEPT (&minus; or &setmn;): builds the set difference of
 	two tables. Let <classname>R</classname> and <classname>S</classname>
 	again be two tables with the same
 	arity. <classname>R</classname> - <classname>S</classname>
