Hibernate count rows with some criterias

Question

Suppose I have a table Person and i want to count all those people whose \"birthDate\" is not null and they are a student. Assuming i have two columns :

birthDat         


        

Answer 1

Number count = (Number) session.createQuery(
    "select count(p.id) from Person p"
    + " where p.birthDate is not null and p.isStudent = true").uniqueResult();