hql查询：两个子选择的总和

Question

这个HQL查询出了什么问题：

select (
( select sum(base)/8 FROM com.agitech.erp.model.rhp.RhpEmployeRubric where ...)
 +
 ( select sum(base)/8 FROM com.agitech.erp.model.rhp.RhpEmployeRubric where ...)
 )

有例外：

unexpected end of subtree

我也试试

select ( select sum(base)/8 FROM RhpEmployeRubric where ...) as sum1, 
       ( select sum(base)/8 FROM RhpEmployeRubric where ...) as sum2

同样的例外！