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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: 2024
.\" Manual: PostgreSQL 15.6 Documentation
.\" Source: PostgreSQL 15.6
.\" Language: English
.\"
.TH "DBLINK_GET_PKEY" "3" "2024" "PostgreSQL 15.6" "PostgreSQL 15.6 Documentation"
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.\" * Define some portability stuff
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.\" http://bugs.debian.org/507673
.\" http://lists.gnu.org/archive/html/groff/2009-02/msg00013.html
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.ie \n(.g .ds Aq \(aq
.el .ds Aq '
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.\" * set default formatting
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.\" disable hyphenation
.nh
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.ad l
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.\" * 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
.\}
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