dblink_get_pkey - returns the positions and field names of a relation's primary key fields

relname 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.

dblink_get_pkey 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.

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) PostgreSQL 17.5 2025 DBLINK_GET_PKEY(3)

dblink_get_pkey - returns the positions and field names of a relation's primary key fields

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 CREATE TYPE dblink_pkey_results AS (position int, colname text); The position column simply runs from 1 to N; it is the number of the field within the primary key, not the number within the table's columns.

dblink_get_pkey(text relname) returns setof dblink_pkey_results