Add a note that AND and OR are commutative. Apparently, they are not in

certain other products.

Author: petere

doc/src/sgml/func.sgml

@@ -1,5 +1,5 @@
 <!--
-$Header: /cvsroot/pgsql/doc/src/sgml/func.sgml,v 1.163 2003/07/31 22:17:11 tgl Exp $
+$Header: /cvsroot/pgsql/doc/src/sgml/func.sgml,v 1.164 2003/08/04 14:00:13 petere Exp $
 PostgreSQL documentation
 -->
 
@@ -162,6 +162,14 @@ PostgreSQL documentation
      </tgroup>
     </informaltable>
    </para>
+
+   <para>
+    The operators <literal>AND</literal> and <literal>OR</literal> are
+    commutative, that is, you can switch the left and right operand
+    without affecting the result.  But see <xref
+    linkend="syntax-express-eval"> for more information about the
+    order of evaluation of subexpressions.
+   </para>
   </sect1>
 
   <sect1 id="functions-comparison">

doc/src/sgml/syntax.sgml

@@ -1,5 +1,5 @@
 <!--
-$Header: /cvsroot/pgsql/doc/src/sgml/syntax.sgml,v 1.79 2003/06/19 23:22:40 tgl Exp $
+$Header: /cvsroot/pgsql/doc/src/sgml/syntax.sgml,v 1.80 2003/08/04 14:00:14 petere Exp $
 -->
 
 <chapter id="sql-syntax">
@@ -1216,7 +1216,7 @@ SELECT name, (SELECT max(pop) FROM cities WHERE cities.state = states.name)
    </para>
   </sect2>
 
-  <sect2>
+  <sect2 id="syntax-express-eval">
    <title>Expression Evaluation</title>
 
    <para>