Description
      </para></entry>
     </row>
    </thead>

    <tbody>
     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>sizing_id</structfield> <type>cardinal_number</type>
      </para>
      <para>
       Identifier of the sizing item
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>sizing_name</structfield> <type>character_data</type>
      </para>
      <para>
       Descriptive name of the sizing item
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>supported_value</structfield> <type>cardinal_number</type>
      </para>
      <para>
       Value of the sizing item, or 0 if the size is unlimited or
       cannot be determined, or null if the features for which the
       sizing item is applicable are not supported
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>comments</structfield> <type>character_data</type>
      </para>
      <para>
       Possibly a comment pertaining to the sizing item
      </para></entry>
     </row>
    </tbody>
   </tgroup>
  </table>
 </sect1>

 <sect1 id="infoschema-table-constraints">
  <title><literal>table_constraints</literal></title>

  <para>
   The view <literal>table_constraints</literal> contains all
   constraints belonging to tables that the current user owns or has
   some privilege other than <literal>SELECT</literal> on.
  </para>

  <table>
   <title><structname>table_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 that contains 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 that contains 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>table_catalog</structfield> <type>sql_identifier</type>
      </para>
      <para>
       Name of the database that contains the table (always the current database)
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>table_schema</structfield> <type>sql_identifier</type>
      </para>
      <para>
       Name of the schema that contains the table
      </para></entry>
     </row>

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

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>constraint_type</structfield> <type>character_data</type>
      </para>
      <para>
       Type of the constraint: <literal>CHECK</literal> (includes not-null constraints),
       <literal>FOREIGN KEY</literal>, <literal>PRIMARY KEY</literal>,
       or <literal>UNIQUE</literal>
      </para></entry>