<query id="updateDocumentCategory" action="update">
    <tables>
        <table name="documents" />
    </tables>
    <columns>
        <column name="category_srl" var="target_category_srl" />
    </columns>
    <conditions>
        <condition operation="equal" column="category_srl" var="source_category_srl" filter="number" notnull="notnull" />
    </conditions>
</query>
