HQL Query to check if size of collection is 0 or empty

Question

I try to generate a HQL query that include user with a empty appoinment collections(mapped by OneToMany):

SELECT u FROM User u JOIN u.appointments uas WHERE          


        

Answer 1

// Hibernate query:
const string hql = "from User u where u.Id = 101 and size(u.Appointments) = 0";