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<div class="titlepage"><div><div><h2 class="title" style="clear: both">
<a name="infoschema-parameters"></a>31.19.<code class="literal">parameters</code></h2></div></div></div>
<p> The view <code class="literal">parameters</code> 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).
</p>
<div class="table">
<a name="id696997"></a><p class="title"><b>Table31.17.<code class="literal">parameters</code> Columns</b></p>
<div class="table-contents"><table summary="parameters 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">specific_catalog</code></td>
<td><code class="type">sql_identifier</code></td>
<td>Name of the database containing the function (always the current database)</td>
</tr>
<tr>
<td><code class="literal">specific_schema</code></td>
<td><code class="type">sql_identifier</code></td>
<td>Name of the schema containing the function</td>
</tr>
<tr>
<td><code class="literal">specific_name</code></td>
<td><code class="type">sql_identifier</code></td>
<td> The “<span class="quote">specific name</span>” of the function. See <a href="infoschema-routines.html" title="31.26.routines">Section31.26, “<code class="literal">routines</code>”</a> for more information.
</td>
</tr>
<tr>
<td><code class="literal">ordinal_position</code></td>
<td><code class="type">cardinal_number</code></td>
<td> Ordinal position of the parameter in the argument list of the
function (count starts at 1)
</td>
</tr>
<tr>
<td><code class="literal">parameter_mode</code></td>
<td><code class="type">character_data</code></td>
<td> Always <code class="literal">IN</code>, meaning input parameter (in the
future there might be other parameter modes)
</td>
</tr>
<tr>
<td><code class="literal">is_result</code></td>
<td><code class="type">character_data</code></td>
<td>Applies to a feature not available in <span class="productname">PostgreSQL</span>
</td>
</tr>
<tr>
<td><code class="literal">as_locator</code></td>
<td><code class="type">character_data</code></td>
<td>Applies to a feature not available in <span class="productname">PostgreSQL</span>
</td>
</tr>
<tr>
<td><code class="literal">parameter_name</code></td>
<td><code class="type">sql_identifier</code></td>
<td>Name of the parameter, or null if the parameter has no name</td>
</tr>
<tr>
<td><code class="literal">data_type</code></td>
<td><code class="type">character_data</code></td>
<td> Data type of the parameter, if it is a built-in type, or
<code class="literal">ARRAY</code> if it is some array (in that case, see
the view <code class="literal">element_types</code>), 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 parameter 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 parameter 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 parameter 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 parameter 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 parameter 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 parameter 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 parameter 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 parameter data types in <span class="productname">PostgreSQL</span>
</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 parameter 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 parameter 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 parameter
</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 parameter,
unique among the data type descriptors pertaining to the
function. This is mainly useful for joining with other
instances of such identifiers. (The specific format of the
identifier is not defined and not guaranteed to remain the same
in future versions.)
</td>
</tr>
</tbody>
</table></div>
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