<structfield>default_collate_catalog</structfield> <type>sql_identifier</type>
      </para>
      <para>
       Name of the database containing the default collation (always the current database, if any collation is identified)
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>default_collate_schema</structfield> <type>sql_identifier</type>
      </para>
      <para>
       Name of the schema containing the default collation
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>default_collate_name</structfield> <type>sql_identifier</type>
      </para>
      <para>
       Name of the default collation.  The default collation is
       identified as the collation that matches
       the <literal>COLLATE</literal> and <literal>CTYPE</literal>
       settings of the current database.  If there is no such
       collation, then this column and the associated schema and
       catalog columns are null.
      </para></entry>
     </row>
    </tbody>
   </tgroup>
  </table>
 </sect1>

 <sect1 id="infoschema-check-constraint-routine-usage">
  <title><literal>check_constraint_routine_usage</literal></title>

  <para>
   The view <literal>check_constraint_routine_usage</literal>
   identifies routines (functions and procedures) that are used by a
   check constraint.  Only those routines are shown that are owned by
   a currently enabled role.
  </para>

  <table>
   <title><structname>check_constraint_routine_usage</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>constraint_catalog</structfield> <type>sql_identifier</type>
      </para>
      <para>
       Name of the database containing the constraint (always the current database)
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>constraint_schema</structfield> <type>sql_identifier</type>
      </para>
      <para>
       Name of the schema containing the constraint
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>constraint_name</structfield> <type>sql_identifier</type>
      </para>
      <para>
       Name of the constraint
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>specific_catalog</structfield> <type>sql_identifier</type>
      </para>
      <para>
       Name of the database containing the function (always the current database)
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>specific_schema</structfield> <type>sql_identifier</type>
      </para>
      <para>
       Name of the schema containing the function
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>specific_name</structfield> <type>sql_identifier</type>
      </para>
      <para>
       The <quote>specific name</quote> of the function.  See <xref linkend="infoschema-routines"/> for more information.
      </para></entry>
     </row>
    </tbody>
   </tgroup>
  </table>
 </sect1>

 <sect1 id="infoschema-check-constraints">
  <title><literal>check_constraints</literal></title>

  <para>
   The view <literal>check_constraints</literal> contains all check
   constraints, either defined on a table or on a domain, that are
   owned by a currently enabled role.  (The owner of the table or
   domain