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Let's say I have 

 List cats = sess.createCriteria(Cat.class) .add( Restrictions.like("name", "F%") .addOrder( Order.asc("name") ) .list();

Lets presume the cat class has 2 more properties, livesUsed and livesTotal.

Is it possible to order ascending the criteria by a query that computes the difference between livesTotal and livesUsed without adding a new column to the db_cats with livesDifference ?

How do I implement that ?

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Neither the group by clause nor the order by clause can contain arithmetic expressions.

Taken from Hibernate documentation : http://docs.jboss.org/hibernate/orm/3.3/reference/en/html/queryhql.html#queryhql-grouping

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