</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 is the owner of the constraint.)
  </para>

  <para>
   The SQL standard considers not-null constraints to be check constraints
   with a <literal>CHECK (<replaceable>column_name</replaceable> IS NOT
   NULL)</literal> expression.  So not-null constraints are also included here
   and don't have a separate view.
  </para>

  <table>
   <title><structname>check_constraints</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>check_clause</structfield> <type>character_data</type>
      </para>
      <para>
       The check expression of the check constraint
      </para></entry>
     </row>
    </tbody>
   </tgroup>
  </table>
 </sect1>

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

  <para>
   The view <literal>collations</literal> contains the collations
   available in the current database.
  </para>

  <table>
   <title><structname>collations</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>collation_catalog</structfield> <type>sql_identifier</type>
      </para>
      <para>
       Name of the database containing the collation (always the current database)
      </para></entry>
     </row>

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

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