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<div class="titlepage"><div><div><h2 class="title" style="clear: both">
<a name="infoschema-sql-features"></a>31.28.<code class="literal">sql_features</code></h2></div></div></div>
<p> The table <code class="literal">sql_features</code> contains information
about which formal features defined in the SQL standard are
supported by <span class="productname">PostgreSQL</span>. This is the
same information that is presented in <a href="features.html" title="AppendixD.SQL Conformance">AppendixD, <i>SQL Conformance</i></a>.
There you can also find some additional background information.
</p>
<div class="table">
<a name="id700541"></a><p class="title"><b>Table31.26.<code class="literal">sql_features</code> Columns</b></p>
<div class="table-contents"><table summary="sql_features 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">feature_id</code></td>
<td><code class="type">character_data</code></td>
<td>Identifier string of the feature</td>
</tr>
<tr>
<td><code class="literal">feature_name</code></td>
<td><code class="type">character_data</code></td>
<td>Descriptive name of the feature</td>
</tr>
<tr>
<td><code class="literal">sub_feature_id</code></td>
<td><code class="type">character_data</code></td>
<td>Identifier string of the subfeature, or a zero-length string if not a subfeature</td>
</tr>
<tr>
<td><code class="literal">sub_feature_name</code></td>
<td><code class="type">character_data</code></td>
<td>Descriptive name of the subfeature, or a zero-length string if not a subfeature</td>
</tr>
<tr>
<td><code class="literal">is_supported</code></td>
<td><code class="type">character_data</code></td>
<td> <code class="literal">YES</code> if the feature is fully supported by the
current version of <span class="productname">PostgreSQL</span>, <code class="literal">NO</code> if not
</td>
</tr>
<tr>
<td><code class="literal">is_verified_by</code></td>
<td><code class="type">character_data</code></td>
<td> Always null, since the <span class="productname">PostgreSQL</span> development group does not
perform formal testing of feature conformance
</td>
</tr>
<tr>
<td><code class="literal">comments</code></td>
<td><code class="type">character_data</code></td>
<td>Possibly a comment about the supported status of the feature</td>
</tr>
</tbody>
</table></div>
</div>
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