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<html>
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<title>31.16.element_types</title>
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<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="sect1" lang="en">
<div class="titlepage"><div><div><h2 class="title" style="clear: both">
<a name="infoschema-element-types"></a>31.16.<code class="literal">element_types</code></h2></div></div></div>
<p>   The view <code class="literal">element_types</code> contains the data type
   descriptors of the elements of arrays.  When a table column,
   domain, function parameter, or function return value is defined to
   be of an array type, the respective information schema view only
   contains <code class="literal">ARRAY</code> in the column
   <code class="literal">data_type</code>.  To obtain information on the element
   type of the array, you can join the respective view with this view.
   For example, to show the columns of a table with data types and
   array element types, if applicable, you could do
</p>
<pre class="programlisting">SELECT c.column_name, c.data_type, e.data_type AS element_type
FROM information_schema.columns c LEFT JOIN information_schema.element_types e
     ON ((c.table_catalog, c.table_schema, c.table_name, 'TABLE', c.dtd_identifier)
       = (e.object_catalog, e.object_schema, e.object_name, e.object_type, e.array_type_identifier))
WHERE c.table_schema = '...' AND c.table_name = '...'
ORDER BY c.ordinal_position;</pre>
<p>
   This view only includes objects that the current user has access
   to, by way of being the owner or having some privilege.
  </p>
<div class="table">
<a name="id696110"></a><p class="title"><b>Table31.14.<code class="literal">element_types</code> Columns</b></p>
<div class="table-contents"><table summary="element_types Columns" border="1">
<colgroup>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>Name</th>
<th>Data Type</th>
<th>Description</th>
</tr></thead>
<tbody>
<tr>
<td><code class="literal">object_catalog</code></td>
<td><code class="type">sql_identifier</code></td>
<td>       Name of the database that contains the object that uses the
       array being described (always the current database)
      </td>
</tr>
<tr>
<td><code class="literal">object_schema</code></td>
<td><code class="type">sql_identifier</code></td>
<td>       Name of the schema that contains the object that uses the array
       being described
      </td>
</tr>
<tr>
<td><code class="literal">object_name</code></td>
<td><code class="type">sql_identifier</code></td>
<td>       Name of the object that uses the array being described
      </td>
</tr>
<tr>
<td><code class="literal">object_type</code></td>
<td><code class="type">character_data</code></td>
<td>       The type of the object that uses the array being described: one
       of <code class="literal">TABLE</code> (the array is used by a column of
       that table), <code class="literal">DOMAIN</code> (the array is used by
       that domain), <code class="literal">ROUTINE</code> (the array is used by
       a parameter or the return data type of that function).
      </td>
</tr>
<tr>
<td><code class="literal">array_type_identifier</code></td>
<td><code class="type">sql_identifier</code></td>
<td>       The identifier of the data type descriptor of the array being
       described.  Use this to join with the
       <code class="literal">dtd_identifier</code> columns of other information
       schema views.
      </td>
</tr>
<tr>
<td><code class="literal">data_type</code></td>
<td><code class="type">character_data</code></td>
<td>       Data type of the array elements, if it is a built-in type, else
       <code class="literal">USER-DEFINED</code> (in that case, the type is
       identified in <code class="literal">udt_name</code> and associated
       columns).
      </td>
</tr>
<tr>
<td><code class="literal">character_maximum_length</code></td>
<td><code class="type">cardinal_number</code></td>
<td>Always null, since this information is not applied to array element data types in <span class="productname">PostgreSQL</span>
</td>
</tr>
<tr>
<td><code class="literal">character_octet_length</code></td>
<td><code class="type">cardinal_number</code></td>
<td>Always null, since this information is not applied to array element data types in <span class="productname">PostgreSQL</span>
</td>
</tr>
<tr>
<td><code class="literal">character_set_catalog</code></td>
<td><code class="type">sql_identifier</code></td>
<td>Applies to a feature not available in <span class="productname">PostgreSQL</span>
</td>
</tr>
<tr>
<td><code class="literal">character_set_schema</code></td>
<td><code class="type">sql_identifier</code></td>
<td>Applies to a feature not available in <span class="productname">PostgreSQL</span>
</td>
</tr>
<tr>
<td><code class="literal">character_set_name</code></td>
<td><code class="type">sql_identifier</code></td>
<td>Applies to a feature not available in <span class="productname">PostgreSQL</span>
</td>
</tr>
<tr>
<td><code class="literal">collation_catalog</code></td>
<td><code class="type">sql_identifier</code></td>
<td>Applies to a feature not available in <span class="productname">PostgreSQL</span>
</td>
</tr>
<tr>
<td><code class="literal">collation_schema</code></td>
<td><code class="type">sql_identifier</code></td>
<td>Applies to a feature not available in <span class="productname">PostgreSQL</span>
</td>
</tr>
<tr>
<td><code class="literal">collation_name</code></td>
<td><code class="type">sql_identifier</code></td>
<td>Applies to a feature not available in <span class="productname">PostgreSQL</span>
</td>
</tr>
<tr>
<td><code class="literal">numeric_precision</code></td>
<td><code class="type">cardinal_number</code></td>
<td>Always null, since this information is not applied to array element data types in <span class="productname">PostgreSQL</span>
</td>
</tr>
<tr>
<td><code class="literal">numeric_precision_radix</code></td>
<td><code class="type">cardinal_number</code></td>
<td>Always null, since this information is not applied to array element data types in <span class="productname">PostgreSQL</span>
</td>
</tr>
<tr>
<td><code class="literal">numeric_scale</code></td>
<td><code class="type">cardinal_number</code></td>
<td>Always null, since this information is not applied to array element data types in <span class="productname">PostgreSQL</span>
</td>
</tr>
<tr>
<td><code class="literal">datetime_precision</code></td>
<td><code class="type">cardinal_number</code></td>
<td>Always null, since this information is not applied to array element data types in <span class="productname">PostgreSQL</span>
</td>
</tr>
<tr>
<td><code class="literal">interval_type</code></td>
<td><code class="type">character_data</code></td>
<td>Always null, since this information is not applied to array element data types in <span class="productname">PostgreSQL</span>
</td>
</tr>
<tr>
<td><code class="literal">interval_precision</code></td>
<td><code class="type">character_data</code></td>
<td>Always null, since this information is not applied to array element data types in <span class="productname">PostgreSQL</span>
</td>
</tr>
<tr>
<td><code class="literal">domain_default</code></td>
<td><code class="type">character_data</code></td>
<td>Not yet implemented</td>
</tr>
<tr>
<td><code class="literal">udt_catalog</code></td>
<td><code class="type">sql_identifier</code></td>
<td>       Name of the database that the data type of the elements is
       defined in (always the current database)
      </td>
</tr>
<tr>
<td><code class="literal">udt_schema</code></td>
<td><code class="type">sql_identifier</code></td>
<td>       Name of the schema that the data type of the elements is
       defined in
      </td>
</tr>
<tr>
<td><code class="literal">udt_name</code></td>
<td><code class="type">sql_identifier</code></td>
<td>       Name of the data type of the elements
      </td>
</tr>
<tr>
<td><code class="literal">scope_catalog</code></td>
<td><code class="type">sql_identifier</code></td>
<td>Applies to a feature not available in <span class="productname">PostgreSQL</span>
</td>
</tr>
<tr>
<td><code class="literal">scope_schema</code></td>
<td><code class="type">sql_identifier</code></td>
<td>Applies to a feature not available in <span class="productname">PostgreSQL</span>
</td>
</tr>
<tr>
<td><code class="literal">scope_name</code></td>
<td><code class="type">sql_identifier</code></td>
<td>Applies to a feature not available in <span class="productname">PostgreSQL</span>
</td>
</tr>
<tr>
<td><code class="literal">maximum_cardinality</code></td>
<td><code class="type">cardinal_number</code></td>
<td>Always null, because arrays always have unlimited maximum cardinality in <span class="productname">PostgreSQL</span>
</td>
</tr>
<tr>
<td><code class="literal">dtd_identifier</code></td>
<td><code class="type">sql_identifier</code></td>
<td>       An identifier of the data type descriptor of the element.  This
       is currently not useful.
      </td>
</tr>
</tbody>
</table></div>
</div>
<br class="table-break">
</div></body>
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