<query id="getCommentDepth" action="select">
    <tables>
        <table name="comments_list" />
    </tables>
    <columns>
        <column name="depth" />
    </columns>
    <conditions>
        <condition operation="equal" column="comment_srl" var="comment_srl" notnull="notnull" />
    </conditions>
</query>
