convert jsonb column value to multiple columns in PostgreSQL

Question

lets say i have a table in PostgreSQL with the following columns:

CREATE TABLE sample
(
id int,
jsonb jsonb,
date date
)

and i inserted thi

Answer 1

It is simple in 9.4 (used LATERAL join and jsonb functions):

    postgres=# SELECT * 
                  FROM sample, jsonb_to_record(jsonb, true) AS x(a text, b text);
     id |            jsonb             |    date     |  a   |   b    
    ----+------------------------------+-------------+------+--------
      1 | {"a": "a", "b": "b"}         | 2014-01-06  | a    | b
      2 | {"a": "a", "b": "b"}         | 2014-01-06  | a    | b
      3 | {"a": "Ahoj", "b": "Nazdar"} | 2014-01-06  | Ahoj | Nazdar
    (3 rows)

exact result:

postgres=# SELECT id, a, b, date 
               FROM sample, jsonb_to_record(jsonb, true) AS x(a text, b text);
 id |  a   |   b    |    date    
----+------+--------+------------
  1 | a    | b      | 2014-01-06
  2 | a    | b      | 2014-01-06
  3 | Ahoj | Nazdar | 2014-01-06
(3 rows)