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Difference between HQL delete request and session.delete ()

I am new to Hibernate and wonder. What is the difference between deleting an object using an HQL query and deleting an object using a delete(...)class method Session?

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Session.delete(...) useful if you already have a link to the object you want to delete.

delete-by-query is useful for deleting multiple objects according to certain criteria, objects that you may not have previously uploaded to the session.

I believe that deletion by request actually loads each object into the session and deletes them individually - someone will correct me if I am mistaken in this.

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