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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>36.34. referential_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-parameters.html" title="36.33. parameters" /><link rel="next" href="infoschema-role-column-grants.html" title="36.35. role_column_grants" /></head><body><div xmlns="http://www.w3.org/TR/xhtml1/transitional" class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="5" align="center">36.34. <code xmlns="http://www.w3.org/1999/xhtml" class="literal">referential_constraints</code></th></tr><tr><td width="10%" align="left"><a accesskey="p" href="infoschema-parameters.html" title="36.33. parameters">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 12.4 Documentation">Home</a></td><td width="10%" align="right"> <a accesskey="n" href="infoschema-role-column-grants.html" title="36.35. role_column_grants">Next</a></td></tr></table><hr></hr></div><div class="sect1" id="INFOSCHEMA-REFERENTIAL-CONSTRAINTS"><div class="titlepage"><div><div><h2 class="title" style="clear: both">36.34. <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.
- Only those constraints are shown for which the current user has
- write access to the referencing table (by way of being the
- owner or having some privilege other than <code class="literal">SELECT</code>).
- </p><div class="table" id="id-1.7.6.38.3"><p class="title"><strong>Table 36.32. <code class="literal">referential_constraints</code> Columns</strong></p><div class="table-contents"><table class="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><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="infoschema-parameters.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="information-schema.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="infoschema-role-column-grants.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">36.33. <code class="literal">parameters</code> </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> 36.35. <code class="literal">role_column_grants</code></td></tr></table></div></body></html>
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