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+'\" t
+.\"     Title: dblink_get_pkey
+.\"    Author: The PostgreSQL Global Development Group
+.\" Generator: DocBook XSL Stylesheets vsnapshot <http://docbook.sf.net/>
+.\"      Date: 2023
+.\"    Manual: PostgreSQL 15.5 Documentation
+.\"    Source: PostgreSQL 15.5
+.\"  Language: English
+.\"
+.TH "DBLINK_GET_PKEY" "3" "2023" "PostgreSQL 15.5" "PostgreSQL 15.5 Documentation"
+.\" -----------------------------------------------------------------
+.\" * Define some portability stuff
+.\" -----------------------------------------------------------------
+.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+.\" http://bugs.debian.org/507673
+.\" http://lists.gnu.org/archive/html/groff/2009-02/msg00013.html
+.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+.ie \n(.g .ds Aq \(aq
+.el       .ds Aq '
+.\" -----------------------------------------------------------------
+.\" * set default formatting
+.\" -----------------------------------------------------------------
+.\" disable hyphenation
+.nh
+.\" disable justification (adjust text to left margin only)
+.ad l
+.\" -----------------------------------------------------------------
+.\" * MAIN CONTENT STARTS HERE *
+.\" -----------------------------------------------------------------
+.SH "NAME"
+dblink_get_pkey \- returns the positions and field names of a relation\*(Aqs primary key fields
+.SH "SYNOPSIS"
+.sp
+.nf
+dblink_get_pkey(text relname) returns setof dblink_pkey_results
+.fi
+.SH "DESCRIPTION"
+.PP
+\fBdblink_get_pkey\fR
+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\&.
+.SH "ARGUMENTS"
+.PP
+\fIrelname\fR
+.RS 4
+Name of a local relation, for example
+foo
+or
+myschema\&.mytab\&. Include double quotes if the name is mixed\-case or contains special characters, for example
+"FooBar"; without quotes, the string will be folded to lower case\&.
+.RE
+.SH "RETURN VALUE"
+.PP
+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
+.sp
+.if n \{\
+.RS 4
+.\}
+.nf
+CREATE TYPE dblink_pkey_results AS (position int, colname text);
+.fi
+.if n \{\
+.RE
+.\}
+.sp
+The
+position
+column simply runs from 1 to
+\fIN\fR; it is the number of the field within the primary key, not the number within the table\*(Aqs columns\&.
+.SH "EXAMPLES"
+.sp
+.if n \{\
+.RS 4
+.\}
+.nf
+CREATE TABLE foobar (
+    f1 int,
+    f2 int,
+    f3 int,
+    PRIMARY KEY (f1, f2, f3)
+);
+CREATE TABLE
+
+SELECT * FROM dblink_get_pkey(\*(Aqfoobar\*(Aq);
+ position | colname
+\-\-\-\-\-\-\-\-\-\-+\-\-\-\-\-\-\-\-\-
+        1 | f1
+        2 | f2
+        3 | f3
+(3 rows)
+.fi
+.if n \{\
+.RE
+.\}