Index: doc/src/sgml/ref/alter_table.sgml
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RCS file: /projects/cvsroot/pgsql/doc/src/sgml/ref/alter_table.sgml,v
retrieving revision 1.76
diff -c -r1.76 alter_table.sgml
*** doc/src/sgml/ref/alter_table.sgml	10 Jan 2005 00:04:43 -0000	1.76
--- doc/src/sgml/ref/alter_table.sgml	12 Jan 2005 09:01:19 -0000
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*** 538,543 ****
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    </para>
  
    <para>
+     To change an integer containing a UNIX timestamp to a <type>timestamp
+ with time zone</type> via a <literal>USING</literal> clause:
+ <programlisting>
+ ALTER TABLE foo
+     ALTER COLUMN foo_timestamp TYPE timestamp with time zone
+     USING
+         timestamp with time zone 'epoch' + foo_timestamp * interval '1 second';
+ </programlisting>
+   </para>
+ 
+   <para>
     To rename an existing column:
  <programlisting>
  ALTER TABLE distributors RENAME COLUMN address TO city;