rhymix/test-phpUnit/db/xml_query/mysql/data/substring.xml

<query id="substringTest" action="select">
    <tables>
        <table name="member" alias="member" />
    </tables>
    <columns>
        <column name="*" />
    </columns>
    <conditions>
        <condition operation="more"  column="substr(extra_vars_t1.value,5,4)" var="var_start_mmdd" notnull="notnull"  pipe="and" />
    </conditions>
</query>