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.
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.
Returns one row for each primary key field, or no rows if the relation has no primary key. The result rowtype is defined as
CREATE TYPE dblink_pkey_results AS (position int, colname text);
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)
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