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<title>31.11.constraint_table_usage</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-constraint-table-usage"></a>31.11.<code class="literal">constraint_table_usage</code></h2></div></div></div>
<p>   The view <code class="literal">constraint_table_usage</code> identifies all
   tables in the current database that are used by some constraint and
   are owned by the current user.  (This is different from the view
   <code class="literal">table_constraints</code>, which identifies all table
   constraints along with the table they are defined on.)  For a
   foreign key constraint, this view identifies the table that the
   foreign key references.  For a unique or primary key constraint,
   this view simply identifies the table the constraint belongs to.
   Check constraints and not-null constraints are not included in this
   view.
  </p>
<div class="table">
<a name="id694857"></a><p class="title"><b>Table31.9.<code class="literal">constraint_table_usage</code> Columns</b></p>
<div class="table-contents"><table summary="constraint_table_usage 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">table_catalog</code></td>
<td><code class="type">sql_identifier</code></td>
<td>       Name of the database that contains the table that is used by
       some constraint (always the current database)
      </td>
</tr>
<tr>
<td><code class="literal">table_schema</code></td>
<td><code class="type">sql_identifier</code></td>
<td>       Name of the schema that contains the table that is used by some
       constraint
      </td>
</tr>
<tr>
<td><code class="literal">table_name</code></td>
<td><code class="type">sql_identifier</code></td>
<td>Name of the table that is used by some constraint</td>
</tr>
<tr>
<td><code class="literal">constraint_catalog</code></td>
<td><code class="type">sql_identifier</code></td>
<td>Name of the database that contains the constraint (always the current database)</td>
</tr>
<tr>
<td><code class="literal">constraint_schema</code></td>
<td><code class="type">sql_identifier</code></td>
<td>Name of the schema that contains the constraint</td>
</tr>
<tr>
<td><code class="literal">constraint_name</code></td>
<td><code class="type">sql_identifier</code></td>
<td>Name of the constraint</td>
</tr>
</tbody>
</table></div>
</div>
<br class="table-break">
</div></body>
</html>