Question

Is it possible to convert this SQL to HQL?
I have tried but I am having difficulty with the nested join syntax.

select 
    emp.FirstName,
    nestedEmp.Hours
from Employee emp
join 
    (select 
        e.Id,
        w.WorkTimeType,
        Hours = SUM(hours)
    from Employee e
    left join WorkTimeEntry w on e.Id  = w.EmployeeId
    group by e.Id, w.WorkTimeType) as nestedEmp
on emp.Id = nestedEmp.Id

Answer 1

The documentation says:

Note that HQL subqueries can occur only in the select or where clauses

So, this is not possible to translate it directly to HQL. (Note: I checked for Hibernate, but it must be the same in NHibernate).