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<html>
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<title>31.20.referential_constraints</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-referential-constraints"></a>31.20.<code class="literal">referential_constraints</code></h2></div></div></div>
<p>   The view <code class="literal">referential_constraints</code> contains all
   referential (foreign key) constraints in the current database that
   belong to a table owned by the current user.
  </p>
<div class="table">
<a name="id697677"></a><p class="title"><b>Table31.18.<code class="literal">referential_constraints</code> Columns</b></p>
<div class="table-contents"><table summary="referential_constraints 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">constraint_catalog</code></td>
<td><code class="literal">sql_identifier</code></td>
<td>Name of the database containing the constraint (always the current database)</td>
</tr>
<tr>
<td><code class="literal">constraint_schema</code></td>
<td><code class="literal">sql_identifier</code></td>
<td>Name of the schema containing the constraint</td>
</tr>
<tr>
<td><code class="literal">constraint_name</code></td>
<td><code class="literal">sql_identifier</code></td>
<td>Name of the constraint</td>
</tr>
<tr>
<td><code class="literal">unique_constraint_catalog</code></td>
<td><code class="literal">sql_identifier</code></td>
<td>       Name of the database that contains the unique or primary key
       constraint that the foreign key constraint references (always
       the current database)
      </td>
</tr>
<tr>
<td><code class="literal">unique_constraint_schema</code></td>
<td><code class="literal">sql_identifier</code></td>
<td>       Name of the schema that contains the unique or primary key
       constraint that the foreign key constraint references
      </td>
</tr>
<tr>
<td><code class="literal">unique_constraint_name</code></td>
<td><code class="literal">sql_identifier</code></td>
<td>       Name of the unique or primary key constraint that the foreign
       key constraint references
      </td>
</tr>
<tr>
<td><code class="literal">match_option</code></td>
<td><code class="literal">character_data</code></td>
<td>       Match option of the foreign key constraint:
       <code class="literal">FULL</code>, <code class="literal">PARTIAL</code>, or
       <code class="literal">NONE</code>.
      </td>
</tr>
<tr>
<td><code class="literal">update_rule</code></td>
<td><code class="literal">character_data</code></td>
<td>       Update rule of the foreign key constraint:
       <code class="literal">CASCADE</code>, <code class="literal">SET NULL</code>,
       <code class="literal">SET DEFAULT</code>, <code class="literal">RESTRICT</code>, or
       <code class="literal">NO ACTION</code>.
      </td>
</tr>
<tr>
<td><code class="literal">delete_rule</code></td>
<td><code class="literal">character_data</code></td>
<td>       Delete rule of the foreign key constraint:
       <code class="literal">CASCADE</code>, <code class="literal">SET NULL</code>,
       <code class="literal">SET DEFAULT</code>, <code class="literal">RESTRICT</code>, or
       <code class="literal">NO ACTION</code>.
      </td>
</tr>
</tbody>
</table></div>
</div>
<br class="table-break">
</div></body>
</html>