HQL怎麼使用union all和order by

select   *   from   (select companyInfo.subject,companyInfo.guId from CompanyInfo  companyInfo  where companyInfo.type='企業動態'  order by companyInfo.startDate desc  ) a  union all  select   *   from   (select infos.subject,infos.guId from Infos  infos,Category  category  where category.categoryName='園區動態' and infos.categoryId=category.guId order by infos.startDate desc ) b  

這段sql怎麼改成hql啊 謝謝