<query id="getContributors" action="select">
    <tables>
        <table name="document_histories" />
    </tables>
    <columns>
        <column name="member_srl" alias="member_srl" />
        <column name="nick_name" alias="nick_name" />
    </columns>
    <conditions>
        <condition operation="equal" column="document_srl" var="document_srl" />
    </conditions>
    <groups>
        <group column="member_srl" />
        <group column="nick_name" />
    </groups>
</query>
