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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>dblink_get_pkey</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="contrib-dblink-cancel-query.html" title="dblink_cancel_query" /><link rel="next" href="contrib-dblink-build-sql-insert.html" title="dblink_build_sql_insert" /></head><body id="docContent" class="container-fluid col-10"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="5" align="center">dblink_get_pkey</th></tr><tr><td width="10%" align="left"><a accesskey="p" href="contrib-dblink-cancel-query.html" title="dblink_cancel_query">Prev</a> </td><td width="10%" align="left"><a accesskey="u" href="dblink.html" title="F.12. dblink — connect to other PostgreSQL databases">Up</a></td><th width="60%" align="center">F.12. dblink — connect to other PostgreSQL databases</th><td width="10%" align="right"><a accesskey="h" href="index.html" title="PostgreSQL 16.2 Documentation">Home</a></td><td width="10%" align="right"> <a accesskey="n" href="contrib-dblink-build-sql-insert.html" title="dblink_build_sql_insert">Next</a></td></tr></table><hr /></div><div class="refentry" id="CONTRIB-DBLINK-GET-PKEY"><div class="titlepage"></div><a id="id-1.11.7.22.20.1" class="indexterm"></a><div class="refnamediv"><h2><span class="refentrytitle">dblink_get_pkey</span></h2><p>dblink_get_pkey — returns the positions and field names of a relation's
+    primary key fields
+   </p></div><div class="refsynopsisdiv"><h2>Synopsis</h2><pre class="synopsis">
+dblink_get_pkey(text relname) returns setof dblink_pkey_results
+</pre></div><div class="refsect1" id="id-1.11.7.22.20.5"><h2>Description</h2><p>
+    <code class="function">dblink_get_pkey</code> provides information about the primary
+    key of a relation in the local database.  This is sometimes useful
+    in generating queries to be sent to remote databases.
+   </p></div><div class="refsect1" id="id-1.11.7.22.20.6"><h2>Arguments</h2><div class="variablelist"><dl class="variablelist"><dt><span class="term"><em class="parameter"><code>relname</code></em></span></dt><dd><p>
+       Name of a local relation, for example <code class="literal">foo</code> or
+       <code class="literal">myschema.mytab</code>.  Include double quotes if the
+       name is mixed-case or contains special characters, for
+       example <code class="literal">"FooBar"</code>; without quotes, the string
+       will be folded to lower case.
+      </p></dd></dl></div></div><div class="refsect1" id="id-1.11.7.22.20.7"><h2>Return Value</h2><p>
+    Returns one row for each primary key field, or no rows if the relation
+    has no primary key.  The result row type is defined as
+
+</p><pre class="programlisting">
+CREATE TYPE dblink_pkey_results AS (position int, colname text);
+</pre><p>
+
+    The <code class="literal">position</code> column simply runs from 1 to <em class="replaceable"><code>N</code></em>;
+    it is the number of the field within the primary key, not the number
+    within the table's columns.
+   </p></div><div class="refsect1" id="id-1.11.7.22.20.8"><h2>Examples</h2><pre class="screen">
+CREATE TABLE foobar (
+    f1 int,
+    f2 int,
+    f3 int,
+    PRIMARY KEY (f1, f2, f3)
+);
+CREATE TABLE
+
+SELECT * FROM dblink_get_pkey('foobar');
+ position | colname
+----------+---------
+        1 | f1
+        2 | f2
+        3 | f3
+(3 rows)
+</pre></div></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="contrib-dblink-cancel-query.html" title="dblink_cancel_query">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="dblink.html" title="F.12. dblink — connect to other PostgreSQL databases">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="contrib-dblink-build-sql-insert.html" title="dblink_build_sql_insert">Next</a></td></tr><tr><td width="40%" align="left" valign="top">dblink_cancel_query </td><td width="20%" align="center"><a accesskey="h" href="index.html" title="PostgreSQL 16.2 Documentation">Home</a></td><td width="40%" align="right" valign="top"> dblink_build_sql_insert</td></tr></table></div></body></html>
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