add into postgres code example

Example 1: return insert results in POSTGRESQL

# to select specific columns
INSERT INTO users (firstname, lastname) VALUES ('Joe', 'Cool') RETURNING id, firstname;
# to return every column
INSERT INTO users (firstname, lastname) VALUES ('Joe', 'Cool') RETURNING *;

Example 2: posgres insert

INSERT INTO films 
  (code, title, did, date_prod, kind)
    VALUES 
  ('T_601', 'Yojimbo', 106, '1961-06-16', 'Drama');