role="catalog_table_entry"><para role="column_definition">
       <structfield>utc_offset</structfield> <type>interval</type>
      </para>
      <para>
       Offset from UTC (positive means east of Greenwich)
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>is_dst</structfield> <type>bool</type>
      </para>
      <para>
       True if this is a daylight-savings abbreviation
      </para></entry>
     </row>
    </tbody>
   </tgroup>
  </table>

  <para>
   While most timezone abbreviations represent fixed offsets from UTC,
   there are some that have historically varied in value
   (see <xref linkend="datetime-config-files"/> for more information).
   In such cases this view presents their current meaning.
  </para>

 </sect1>

 <sect1 id="view-pg-timezone-names">
  <title><structname>pg_timezone_names</structname></title>

  <indexterm zone="view-pg-timezone-names">
   <primary>pg_timezone_names</primary>
  </indexterm>

  <para>
   The view <structname>pg_timezone_names</structname> provides a list
   of time zone names that are recognized by <command>SET TIMEZONE</command>,
   along with their associated abbreviations, UTC offsets,
   and daylight-savings status.  (Technically,
   <productname>PostgreSQL</productname> does not use UTC because leap
   seconds are not handled.)
   Unlike the abbreviations shown in <link
   linkend="view-pg-timezone-abbrevs"><structname>pg_timezone_abbrevs</structname></link>, many of these names imply a set of daylight-savings transition
   date rules.  Therefore, the associated information changes across local DST
   boundaries.  The displayed information is computed based on the current
   value of <function>CURRENT_TIMESTAMP</function>.
  </para>

  <table>
   <title><structname>pg_timezone_names</structname> Columns</title>
   <tgroup cols="1">
    <thead>
     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       Column Type
      </para>
      <para>
       Description
      </para></entry>
     </row>
    </thead>

    <tbody>
     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>name</structfield> <type>text</type>
      </para>
      <para>
       Time zone name
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>abbrev</structfield> <type>text</type>
      </para>
      <para>
       Time zone abbreviation
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>utc_offset</structfield> <type>interval</type>
      </para>
      <para>
       Offset from UTC (positive means east of Greenwich)
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>is_dst</structfield> <type>bool</type>
      </para>
      <para>
       True if currently observing daylight savings
      </para></entry>
     </row>
    </tbody>
   </tgroup>
  </table>

 </sect1>

 <sect1 id="view-pg-user">
  <title><structname>pg_user</structname></title>

  <indexterm zone="view-pg-user">
   <primary>pg_user</primary>
  </indexterm>

  <para>
   The view <structname>pg_user</structname> provides access to
   information about database users.  This is simply a publicly
   readable view of
   <link linkend="view-pg-shadow"><structname>pg_shadow</structname></link>
   that blanks out the password field.
  </para>

  <table>
   <title><structname>pg_user</structname> Columns</title>
   <tgroup cols="1">
    <thead>
     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       Column Type
      </para>
      <para>
       Description
      </para></entry>
     </row>
    </thead>

    <tbody>
     <row>
      <entry role="catalog_table_entry"><para role="column_definition">