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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
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NAME="AEN116638"
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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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><A
NAME="AEN116640"
></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
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><A
NAME="AEN116644"
></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
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><A
NAME="AEN116655"
></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 rowtype is defined as
</P><PRE
CLASS="PROGRAMLISTING"
>CREATE TYPE dblink_pkey_results AS (position int, colname text);
</PRE
><P>
</P
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></A
><H2
>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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