new wesqlQuery('example', array(
    'union' => array(
        new wesqlQuery('example_subquery_1', array(
            'select' => array('param1', 'param2'),
            'from' => array('table1'),
            'where' => array('param1 != 0'),
        )),
        new wesqlQuery('example_subquery_2', array(
            'select' => array('param3', 'param4'),
            'from' => array('table2'),
            'where' => array('param3 != {member}'),
        ), array(
            'member' =>. 1,
        )),
    ),
));