Scheme conversion MySQL to PGSQL

Hello *

I try to convert a Database scheme from mySQL to pgSQL and have
problems  with the line:

      KEY post_date     (post_date)

and later probably with the lines

      UNIQUE KEY user   (stat_login)
and
      KEY forum_id      (forum_id)

too.  How to solv this prolem?

Thanks
Michelle

----8<----------------------------------------------------------------
CREATE TABLE sqmf_forum (
      forum_id          serial          NOT NULL,
      forum_name        varchar(50)     NOT NULL,
      forum_description varchar(250)    NOT NULL,
      forum_visible     integer         NOT NULL default '0',
      display_order     integer         NOT NULL default '1',
      PRIMARY KEY       (forum_id)
);

CREATE TABLE sqmf_post (
      post_id           serial          NOT NULL,
      thread_id         integer         NOT NULL,
      post_login        varchar         NOT NULL,
      post_date         timestamp       NOT NULL,
      post_content      text            NOT NULL,
      PRIMARY KEY       (post_id),
      KEY post_date     (post_date)
);

CREATE TABLE sqmf_stat (
      stat_login        varchar(70)     NOT NULL,
      stat_post         integer         default '1',
      stat_thread       integer         default '1',
      PRIMARY KEY       (stat_login),
      UNIQUE KEY user   (stat_login)
);

CREATE TABLE sqmf_thread (
      thread_id         serial          NOT NULL,
      forum_id          integer         NOT NULL,
      thread_login      varchar(70)     NOT NULL,
      thread_date       datetime        NOT NULL,
      thread_title      varchar(200)    NOT NULL,
      thread_content    longtext        NOT NULL,
      nb_view           integer         NOT NULL default '0',
      nb_post           integer         NOT NULL default '1',
      last_post_date    datetime        NOT NULL,
      last_post_login   varchar(70)     NOT NULL,
      PRIMARY KEY       (thread_id),
      KEY forum_id      (forum_id)
);
----8<----------------------------------------------------------------


-- 
Michelle Konzack
00372-54541400