How to Query Supplier Discussion's History Table

Could anyone know how to query History Table on Discussions?

thanks.

==This is Supplier Discussions function Query==

select t.auto_number,

    decode(t.status, 1, 'Close', 'Open') status,

    t.subject,

    t.message,

    (select l.entryvalue from listentry l where t.priority = entryid(+)) priority,

    (select i.item_number from item i where dp.list32 =i.id) item_number,

    t.*

 from discussion t, discussion_p2p3 dp

 where t.subclass = 2476857 --SDS

  and t.id = dp.id