Query Result like Horizontal PostgreSQL Database

This is probably a good starting point (version 8.4+ only):

SELECT id_field, array_agg(value_field1), array_agg(value_field2)
FROM data_table
GROUP BY id_field

array_agg returns an array, but you can CAST that to text and edit as needed (see clarifications, below).

Prior to version 8.4, you have to define it yourself prior to use:

CREATE AGGREGATE array_agg (anyelement)
(
    sfunc = array_append,
    stype = anyarray,
    initcond = '{}'
);

Semoga  bermanfaat bagi perkembangan programmer