<structfield>position_in_unique_constraint</structfield> <type>cardinal_number</type>
      </para>
      <para>
       For a foreign-key constraint, ordinal position of the referenced
       column within its unique constraint (count starts at 1);
       otherwise null
      </para></entry>
     </row>
    </tbody>
   </tgroup>
  </table>
 </sect1>

 <sect1 id="infoschema-parameters">
  <title><literal>parameters</literal></title>

  <para>
   The view <literal>parameters</literal> contains information about
   the parameters (arguments) of all functions in the current database.
   Only those functions are shown that the current user has access to
   (by way of being the owner or having some privilege).
  </para>

  <table>
   <title><structname>parameters</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>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>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>ordinal_position</structfield> <type>cardinal_number</type>
      </para>
      <para>
       Ordinal position of the parameter in the argument list of the
       function (count starts at 1)
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>parameter_mode</structfield> <type>character_data</type>
      </para>
      <para>
       <literal>IN</literal> for input parameter,
       <literal>OUT</literal> for output parameter,
       and <literal>INOUT</literal> for input/output parameter.
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>is_result</structfield> <type>yes_or_no</type>
      </para>
      <para>
       Applies to a feature not available in <productname>PostgreSQL</productname>
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>as_locator</structfield> <type>yes_or_no</type>
      </para>
      <para>
       Applies to a feature not available in <productname>PostgreSQL</productname>
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>parameter_name</structfield> <type>sql_identifier</type>
      </para>
      <para>
       Name of the parameter, or null if the parameter has no name
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>data_type</structfield> <type>character_data</type>
      </para>
      <para>
       Data type of the parameter, if it is a built-in type, or
       <literal>ARRAY</literal> if it is some array (in that case, see
       the view <literal>element_types</literal>), else
       <literal>USER-DEFINED</literal> (in that case, the type is