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    <p>Yes, there are a number of options you can use to do what you want. Ayende Rahien has a <a href="http://nhforge.org/blogs/nhibernate/archive/2009/04/10/nhibernate-mapping-inheritance.aspx" rel="nofollow noreferrer">great demonstration of the options</a> for table inheritance and the resulting table structures. </p> <p>Using the class hierarchy that has an abstract BaseOrder as a parent to CompleteOrder and IncompleteOrder, the union case is:</p> <pre><code>&lt;class name="CompleteOrder" table="CompleteOrders"&gt; &lt;id name="Id"&gt; &lt;generator class="identity"/&gt; &lt;/id&gt; &lt;property name="Status"/&gt; &lt;/class&gt; &lt;class name="IncompleteOrder" table="IncompleteOrders"&gt; &lt;id name="Id"&gt; &lt;generator class="identity"/&gt; &lt;/id&gt; &lt;/class&gt; </code></pre> <p>or</p> <pre><code> &lt;class name="BaseOrder" abstract="true" table="Orders"&gt; &lt;id name="Id"&gt; &lt;generator class="hilo"/&gt; &lt;/id&gt; &lt;union-subclass table="CompleteOrders" name="CompleteOrder"&gt; &lt;property name="Status"/&gt; &lt;/union-subclass&gt; &lt;union-subclass table="IncompleteOrders" name="IncompleteOrder"&gt; &lt;/union-subclass&gt; &lt;/class&gt; </code></pre> <p>which also has separate tables but doesn't use a union for the query. </p> <p>Check out the <a href="http://nhforge.org/blogs/nhibernate/archive/2009/04/10/nhibernate-mapping-inheritance.aspx" rel="nofollow noreferrer">article</a>, it will probably help greatly.</p> <hr> <p><strong>edit:</strong></p> <p>There was a comment about not wanting to cast but it's now gone. I'm not sure if it was deleted or if it was a SO issue...</p> <p>If BaseOrder.Status is a virtual property, you should be able to pass around a BaseOrder and not need to cast. You'll have to maintain the extra class hierarchy but you can still query them together and, for the most part, the rest of the application shouldn't need to know about the subclasses. </p> <p>Good luck!</p>
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    1. POIs it possible to map multiple tables to a single domain model using NHibernate?
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    1. COI did read through the link however what I found was that in the given example there’s a table for the abstract class called “Parties” where in my case I don’t have this table.
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    2. COThe casting issue was that if I have different properties in the children class (InCompleteOrder and Order) then I would need to cast between the two. But I don’t think there’s any work around to it.
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    3. COHi Jeffrey, there are 2 examples with a base table and 2 without. Take a look at the 2nd and 4th examples.
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