Question

I have 2 tables (entity) a person entity and a vacation entity. One person can have many vacations.

What I’m trying to do is the following query:

Select all the persons period!, but for the persons who have a vacations, I want to fetch all of the persons vacations which have a condition , lest just say startDate is between something.

Just to be clear no matter the constraints on the vacations I still want to get all the persons.this is my current HQL query:

select distinct p 
from Person as p 
left join fetch p.vacations as v 
where v.startDate between '2011-07-01' and '2011-07-30'

The problem with it is that it constraint my persons an returns only the ones who have a vacation that respects the condition….Can someone help please?

I have no problem if someone can tell me this in native SQL

UPDATE Resolved in native SQL thanks to @Quasdunk:

SELECT * 
FROM person as p 
LEFT JOIN 
     (SELECT * FROM vacation
      WHERE startDate BETWEEN '2011-08-01' AND '2011-08-30') as v ON v.person_id = p.id

My new problem is how to convert it to an HQL query so I can fetch the vacations for each person, and the persons to be distinct (the conditions remain the same).

Answer 1

In native SQL this would be:

SELECT * 
FROM person 
LEFT JOIN (SELECT * 
           FROM vacations 
           WHERE startDate BETWEEN '2011-07-01' AND '2011-07-30')

untested, but you get the idea 🙂