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- 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-1.11.7.19.20.5"><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-1.11.7.19.20.6"><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-1.11.7.19.20.7"><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-1.11.7.19.20.8"><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">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="dblink.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="contrib-dblink-build-sql-insert.html">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">Home</a></td><td width="40%" align="right" valign="top"> dblink_build_sql_insert</td></tr></table></div></body></html>
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