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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>37.52. 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 Vsnapshot" /><link rel="prev" href="infoschema-sql-sizing.html" title="37.51. sql_sizing" /><link rel="next" href="infoschema-table-privileges.html" title="37.53. table_privileges" /></head><body id="docContent" class="container-fluid col-10"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="5" align="center">37.52. <code class="literal">table_constraints</code></th></tr><tr><td width="10%" align="left"><a accesskey="p" href="infoschema-sql-sizing.html" title="37.51. sql_sizing">Prev</a> </td><td width="10%" align="left"><a accesskey="u" href="information-schema.html" title="Chapter 37. The Information Schema">Up</a></td><th width="60%" align="center">Chapter 37. The Information Schema</th><td width="10%" align="right"><a accesskey="h" href="index.html" title="PostgreSQL 16.3 Documentation">Home</a></td><td width="10%" align="right"> <a accesskey="n" href="infoschema-table-privileges.html" title="37.53. table_privileges">Next</a></td></tr></table><hr /></div><div class="sect1" id="INFOSCHEMA-TABLE-CONSTRAINTS"><div class="titlepage"><div><div><h2 class="title" style="clear: both">37.52. <code class="literal">table_constraints</code> <a href="#INFOSCHEMA-TABLE-CONSTRAINTS" class="id_link">#</a></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-1.7.6.56.3"><p class="title"><strong>Table 37.50. <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><tr><td class="catalog_table_entry"><p class="column_definition">
<code class="structfield">nulls_distinct</code> <code class="type">yes_or_no</code>
</p>
<p>
If the constraint is a unique constraint, then <code class="literal">YES</code>
if the constraint treats nulls as distinct or <code class="literal">NO</code> if
it treats nulls as not distinct, otherwise null for other types of
constraints.
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