Inheritance doesn't work in Query - spring-data

Question

I'm new to Spring and i have an issue with the following query:
String rejected_offer_query = "SELECT b.job_instance_id, b.start_time, count (*) " +
"FROM SygaOfferRejected s , BatchJobExecution b, BatchJobInstance bi "+
"where s.heure_debut = b.start_time " +
"and s.heure_fin = b.end_time " +
"and b.job_execution_id = bi.job_instance_id " +
"and bi.job_name = :batchName "+
"and b.status = :batchStatus " +
"group by b.job_instance_id";
It doesn't return data, but it should return one row as a result: (Test made directly with MySql).
I think it's an inheritance problem because when i try to execute the same query with a super class it works :
SELECT b.job_instance_id, b.start_time, count (*) " +
"FROM SygaOffer s , BatchJobExecution b, BatchJobInstance bi "+
"where s.heure_debut = b.start_time " +
"and s.heure_fin = b.end_time " +
"and b.job_execution_id = bi.job_instance_id " +
"and bi.job_name = :batchName "+
"and b.status = :batchStatus " +
"group by b.job_instance_id"
The SygaOfferRejected class extends the SygaOffer, here's the source code;
#Entity
#Inheritance
#Table(name = "bob_syga_off")
public class SygaOffer {
#Id
private long id_offre;
private String acteur;
private String heure_debut;
private String heure_fin;
private String reference_offre;
private int retry;
}
------------------------------------------
#Entity
#Table(name ="bob_syga_offr_rejected")
public class SygaOfferRejected extends SygaOffer{
}

Answer 1

The inheritance strategy is the issue i should specify the TABLE_PER_CLASS type in the parent class :
#Inheritance(strategy=InheritanceType.TABLE_PER_CLASS)
Hope that helps ;)