linkend="catalog-pg-tablespace"><structname>pg_tablespace</structname></link>.<structfield>spcname</structfield>)
      </para>
      <para>
       Name of tablespace containing table (null if default for database)
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>hasindexes</structfield> <type>bool</type>
       (references <link linkend="catalog-pg-class"><structname>pg_class</structname></link>.<structfield>relhasindex</structfield>)
      </para>
      <para>
       True if table has (or recently had) any indexes
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>hasrules</structfield> <type>bool</type>
       (references <link linkend="catalog-pg-class"><structname>pg_class</structname></link>.<structfield>relhasrules</structfield>)
      </para>
      <para>
       True if table has (or once had) rules
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>hastriggers</structfield> <type>bool</type>
       (references <link linkend="catalog-pg-class"><structname>pg_class</structname></link>.<structfield>relhastriggers</structfield>)
      </para>
      <para>
       True if table has (or once had) triggers
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>rowsecurity</structfield> <type>bool</type>
       (references <link linkend="catalog-pg-class"><structname>pg_class</structname></link>.<structfield>relrowsecurity</structfield>)
      </para>
      <para>
       True if row security is enabled on the table
      </para></entry>
     </row>
    </tbody>
   </tgroup>
  </table>

 </sect1>

 <sect1 id="view-pg-timezone-abbrevs">
  <title><structname>pg_timezone_abbrevs</structname></title>

  <indexterm zone="view-pg-timezone-abbrevs">
   <primary>pg_timezone_abbrevs</primary>
  </indexterm>

  <para>
   The view <structname>pg_timezone_abbrevs</structname> provides a list
   of time zone abbreviations that are currently recognized by the datetime
   input routines.  The contents of this view change when the
   <xref linkend="guc-timezone"/> or
   <xref linkend="guc-timezone-abbreviations"/> run-time parameters are
   modified.
  </para>

  <table>
   <title><structname>pg_timezone_abbrevs</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>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 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>