Query regarding EJB -QL --- Help me out

Hello, i have a basic question regarding QL
as such if we want findBYxxx() we provide a similar query in QL descriptor, this is ok..
but the problem is..
how can i proceed with query that retrieves rows from multiple tables (referential integrity)..
suppose i call retrieveRows() menthod on entity (cmp) from my view (jsp), then what code i have to write in retrieveRows() method of bean (cmp entity). and what has to be specified in the QL deploment Descriptor.
Please guide me with an example code (if possible) plzzzzz..
Thanks jaagy

This is an example of relation Street -> Town
Data-schema:
Town(
code Integer,
name String
Street(
code Integer,
name String,
town_code Interger
ejb-jar.xml fragment:
<entity>
            <ejb-name>StreetBean</ejb-name>
            <local-home>StreetHome</local-home>
            <local>Street</local>
            <ejb-class>StreetBean</ejb-class>
            <persistence-type>Container</persistence-type>
            <prim-key-class>java.lang.Integer</prim-key-class>
            <reentrant>False</reentrant>
            <cmp-version>2.x</cmp-version>
            <abstract-schema-name>host</abstract-schema-name>
            <cmp-field><field-name>code</field-name></cmp-field>
            <cmp-field><field-name>name</field-name></cmp-field>
            <primkey-field>code</primkey-field>
          <query>
                <query-method>
                    <method-name>findByTown</method-name>
                <method-params>
                    <method-param>java.lang.String</method-param>
                </method-params>
                </query-method>
                <ejb-ql><![CDATA[
                    SELECT OBJECT(s)
                    FROM street s
                    WHERE s.town.name = ?1
                    ]]>
                </ejb-ql>
            </query>
        </entity>
        <ejb-relation>
            <ejb-relation-name>Town-Street</ejb-relation-name>
            <ejb-relationship-role>
                <ejb-relationship-role-name>town-has-streets</ejb-relationship-role-name>
                <multiplicity>One</multiplicity>
                <relationship-role-source>
                    <ejb-name>TownBean</ejb-name>
                </relationship-role-source>
                <cmr-field>
                    <cmr-field-name>townStreets</cmr-field-name>
                    <cmr-field-type>java.util.Set</cmr-field-type>
                </cmr-field>
            </ejb-relationship-role>
            <ejb-relationship-role>
                <ejb-relationship-role-name>street-belongs-to-town</ejb-relationship-role-name>
                <multiplicity>Many</multiplicity>
                <cascade-delete/>
                <relationship-role-source>
                    <ejb-name>StreetBean</ejb-name>
                </relationship-role-source>
                <cmr-field>
                    <cmr-field-name>town_code</cmr-field-name>
                </cmr-field>
            </ejb-relationship-role>
        </ejb-relation>

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