dblink_get_pkey(3) [centos man page]

DBLINK_GET_PKEY(3)					  PostgreSQL 9.2.7 Documentation					DBLINK_GET_PKEY(3)

NAME

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

SYNOPSIS

       dblink_get_pkey(text relname) returns setof dblink_pkey_results

DESCRIPTION

       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.

ARGUMENTS

       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.

RETURN VALUE

       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.

EXAMPLES

	   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 9.2.7						    2014-02-17							DBLINK_GET_PKEY(3)

DBLINK_BUILD_SQL_DELETE(3)				  PostgreSQL 9.2.7 Documentation				DBLINK_BUILD_SQL_DELETE(3)

NAME

       dblink_build_sql_delete - builds a DELETE statement using supplied values for primary key field values

SYNOPSIS

       dblink_build_sql_delete(text relname,
			       int2vector primary_key_attnums,
			       integer num_primary_key_atts,
			       text[] tgt_pk_att_vals_array) returns text

DESCRIPTION

       dblink_build_sql_delete can be useful in doing selective replication of a local table to a remote database. It builds a SQL DELETE command
       that will delete the row with the given primary key values.

ARGUMENTS

       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.

       primary_key_attnums
	   Attribute numbers (1-based) of the primary key fields, for example 1 2.

       num_primary_key_atts
	   The number of primary key fields.

       tgt_pk_att_vals_array
	   Values of the primary key fields to be used in the resulting DELETE command. Each field is represented in text form.

RETURN VALUE

       Returns the requested SQL statement as text.

NOTES

       As of PostgreSQL 9.0, the attribute numbers in primary_key_attnums are interpreted as logical column numbers, corresponding to the column's
       position in SELECT * FROM relname. Previous versions interpreted the numbers as physical column positions. There is a difference if any
       column(s) to the left of the indicated column have been dropped during the lifetime of the table.

EXAMPLES

	   SELECT dblink_build_sql_delete('"MyFoo"', '1 2', 2, '{"1", "b"}');
		      dblink_build_sql_delete
	   ---------------------------------------------
	    DELETE FROM "MyFoo" WHERE f1='1' AND f2='b'
	   (1 row)

PostgreSQL 9.2.7						    2014-02-17						DBLINK_BUILD_SQL_DELETE(3)