[hibernate-users] different HQL condition in classes with inheritance for different subclasses

Hi, I am writing an application to manage a library. I am doing this for learning purposes only. I have different customer types that have an associated maximum number of items that they may lend from the library. The customers have a base class that looks like that (shortend for simplicity) @Entity @Inheritance(strategy = InheritanceType.SINGLE_TABLE) @DiscriminatorColumn(discriminatorType = DiscriminatorType.STRING, name = "type") abstract class Customer { ... public abstract int getItemsAllowed(); public Collection<ItemLoan> getItemLoans(); } Then there may be subclasses like @... class NormalCustomer { public static final int MAX_ITEMS = 5; public int getItemsAllowed() {return MAX_ITEMS;} } @... class VIPCustomer { public static final int MAX_ITEMS = 30; public int getItemsAllowed() {return MAX_ITEMS;} } Now I want to get a list with all customers that are currently lending the maximum allowed number of items (getItemLoans().size() == getItemsAllowed()). Is something like that possible with one hql query? Thanks, Thomas