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>dblink_get_pkey</H1
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><H2
>Name</H2
>dblink_get_pkey&nbsp;--&nbsp;returns the positions and field names of a relation's
    primary key fields
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>Synopsis</H2
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CLASS="SYNOPSIS"
>    dblink_get_pkey(text relname) returns setof dblink_pkey_results
   </PRE
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>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
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>Arguments</H2
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><DT
><TT
CLASS="PARAMETER"
>relname</TT
></DT
><DD
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>       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.
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><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 rowtype is defined as

    </P><PRE
CLASS="PROGRAMLISTING"
>CREATE TYPE dblink_pkey_results AS (position int, colname text);
    </PRE
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>Example</H2
><PRE
CLASS="PROGRAMLISTING"
>test=# create table foobar(f1 int, f2 int, f3 int,
test(#   primary key(f1,f2,f3));
CREATE TABLE
test=# select * from dblink_get_pkey('foobar');
 position | colname
----------+---------
        1 | f1
        2 | f2
        3 | f3
(3 rows)
   </PRE
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