hql query : sum of two sub-select

问题

what's wrong with this HQL query :

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 ...)
 )

Having the exception :

unexpected end of subtree

i also try

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

same exception !

来源：https://stackoverflow.com/questions/23303315/hql-query-sum-of-two-sub-select