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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>36.48. table_constraints</title><link rel="stylesheet" type="text/css" href="stylesheet.css" /><link rev="made" href="pgsql-docs@lists.postgresql.org" /><meta name="generator" content="DocBook XSL Stylesheets V1.79.1" /><link rel="prev" href="infoschema-sql-sizing.html" title="36.47. sql_sizing" /><link rel="next" href="infoschema-table-privileges.html" title="36.49. table_privileges" /></head><body id="docContent" class="container-fluid col-10"><div xmlns="http://www.w3.org/TR/xhtml1/transitional" class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="5" align="center">36.48. <code xmlns="http://www.w3.org/1999/xhtml" class="literal">table_constraints</code></th></tr><tr><td width="10%" align="left"><a accesskey="p" href="infoschema-sql-sizing.html" title="36.47. sql_sizing">Prev</a> </td><td width="10%" align="left"><a accesskey="u" href="information-schema.html" title="Chapter 36. The Information Schema">Up</a></td><th width="60%" align="center">Chapter 36. The Information Schema</th><td width="10%" align="right"><a accesskey="h" href="index.html" title="PostgreSQL 13.4 Documentation">Home</a></td><td width="10%" align="right"> <a accesskey="n" href="infoschema-table-privileges.html" title="36.49. table_privileges">Next</a></td></tr></table><hr></hr></div><div class="sect1" id="INFOSCHEMA-TABLE-CONSTRAINTS"><div class="titlepage"><div><div><h2 class="title" style="clear: both">36.48. <code class="literal">table_constraints</code></h2></div></div></div><p>
The view <code class="literal">table_constraints</code> contains all
constraints belonging to tables that the current user owns or has
some privilege other than <code class="literal">SELECT</code> on.
</p><div class="table" id="id-1.7.6.52.3"><p class="title"><strong>Table 36.46. <code class="structname">table_constraints</code> Columns</strong></p><div class="table-contents"><table class="table" summary="table_constraints Columns" border="1"><colgroup><col /></colgroup><thead><tr><th class="catalog_table_entry"><p class="column_definition">
Column Type
</p>
<p>
Description
</p></th></tr></thead><tbody><tr><td class="catalog_table_entry"><p class="column_definition">
<code class="structfield">constraint_catalog</code> <code class="type">sql_identifier</code>
</p>
<p>
Name of the database that contains the constraint (always the current database)
</p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
<code class="structfield">constraint_schema</code> <code class="type">sql_identifier</code>
</p>
<p>
Name of the schema that contains the constraint
</p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
<code class="structfield">constraint_name</code> <code class="type">sql_identifier</code>
</p>
<p>
Name of the constraint
</p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
<code class="structfield">table_catalog</code> <code class="type">sql_identifier</code>
</p>
<p>
Name of the database that contains the table (always the current database)
</p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
<code class="structfield">table_schema</code> <code class="type">sql_identifier</code>
</p>
<p>
Name of the schema that contains the table
</p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
<code class="structfield">table_name</code> <code class="type">sql_identifier</code>
</p>
<p>
Name of the table
</p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
<code class="structfield">constraint_type</code> <code class="type">character_data</code>
</p>
<p>
Type of the constraint: <code class="literal">CHECK</code>,
<code class="literal">FOREIGN KEY</code>, <code class="literal">PRIMARY KEY</code>,
or <code class="literal">UNIQUE</code>
</p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
<code class="structfield">is_deferrable</code> <code class="type">yes_or_no</code>
</p>
<p>
<code class="literal">YES</code> if the constraint is deferrable, <code class="literal">NO</code> if not
</p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
<code class="structfield">initially_deferred</code> <code class="type">yes_or_no</code>
</p>
<p>
<code class="literal">YES</code> if the constraint is deferrable and initially deferred, <code class="literal">NO</code> if not
</p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
<code class="structfield">enforced</code> <code class="type">yes_or_no</code>
</p>
<p>
Applies to a feature not available in
<span class="productname">PostgreSQL</span> (currently always
<code class="literal">YES</code>)
</p></td></tr></tbody></table></div></div><br class="table-break" /></div><div xmlns="http://www.w3.org/TR/xhtml1/transitional" class="navfooter"><hr></hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="infoschema-sql-sizing.html" title="36.47. sql_sizing">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="information-schema.html" title="Chapter 36. The Information Schema">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="infoschema-table-privileges.html" title="36.49. table_privileges">Next</a></td></tr><tr><td width="40%" align="left" valign="top">36.47. <code xmlns="http://www.w3.org/1999/xhtml" class="literal">sql_sizing</code> </td><td width="20%" align="center"><a accesskey="h" href="index.html" title="PostgreSQL 13.4 Documentation">Home</a></td><td width="40%" align="right" valign="top"> 36.49. <code xmlns="http://www.w3.org/1999/xhtml" class="literal">table_privileges</code></td></tr></table></div></body></html>
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