How to pass input parameters as a output mapping in select query

Question

<query id="Data_Services" useConfig="Data_Services">
    <sql>select :parameters from :tablenames</sql>
    <param name="tablenames" sqlType="QUERY_STRING"/>
    <param name="parameters" sqlType="QUERY_STRING" type="INOUT"/>
</query>
<operation name="Select_Query">
    <call-query href="Data_Services">
         <with-param name="tablenames" query-param="tablenames"/>
         <with-param name="parameters" query-param="parameters"/>
    </call-query>
</operation>
<resource method="GET" path="Select_Query">
    <call-query href="Data_Services">
         <with-param name="tablenames" query-param="tablenames"/>
         <with-param name="parameters" query-param="parameters"/>
    </call-query>
</resource>

I am passing inputs are :table name(employee) & :parameters(id,name) and my input type sql Type="QUERY_STRING", Eg: "select :parameters from :table name. Now I want to generate output mappings for that passing input:parameters(id,name) for id and name just I added output mapping fields for that id &name, but when I am passing inputs is parameter(id,name) for these passing parameters I need to generate Output mappings. Please see the code above.