<query id="getChildComments" action="select">
    <tables>
        <table name="comments" />
    </tables>
    <columns>
        <column name="comment_srl" />
        <column name="member_srl" />
    </columns>
    <conditions>
        <condition operation="equal" column="parent_srl" var="comment_srl" filter="number" notnull="notnull" />
    </conditions>
</query>
