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>dblink_get_pkey</H1
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><H2
>Name</H2
>dblink_get_pkey -- returns the positions and field names of a relation's
primary key fields
</DIV
><DIV
CLASS="REFSYNOPSISDIV"
><A
NAME="AEN147745"
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><H2
>Synopsis</H2
><PRE
CLASS="SYNOPSIS"
>dblink_get_pkey(text relname) returns setof dblink_pkey_results</PRE
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><DIV
CLASS="REFSECT1"
><A
NAME="AEN147747"
></A
><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"
><A
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></A
><H2
>Arguments</H2
><P
></P
><DIV
CLASS="VARIABLELIST"
><DL
><DT
><TT
CLASS="PARAMETER"
>relname</TT
></DT
><DD
><P
> Name of a local relation, for example <TT
CLASS="LITERAL"
>foo</TT
> or
<TT
CLASS="LITERAL"
>myschema.mytab</TT
>. Include double quotes if the
name is mixed-case or contains special characters, for
example <TT
CLASS="LITERAL"
>"FooBar"</TT
>; without quotes, the string
will be folded to lower case.
</P
></DD
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><A
NAME="AEN147762"
></A
><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 <TT
CLASS="LITERAL"
>position</TT
> column simply runs from 1 to <TT
CLASS="REPLACEABLE"
><I
>N</I
></TT
>;
it is the number of the field within the primary key, not the number
within the table's columns.
</P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN147768"
></A
><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
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