$args = array (
    'post_type' => 'page',
    'meta_key' => 'someMetaKeyName',
);

// The Query
$query = new WP_Query( $args );

global $wpdb;
        $pt = 'clients';
        $mk = 'trainerid';
        $mv = $pid;
        $mk1 = 'email';
        $mk2 = 'phone';
        $mk3 = 'gender';
        $mk4 = 'dob';
        $mk5 = 'photo';
        $mk6 = 'registrationts';
        $mk7 = 'activationts';
        $ord = 'p.post_name ASC';

        $sql = "
        SELECT p.ID, p.post_title AS fullname, pm1.meta_value AS email, pm2.meta_value AS phone, pm3.meta_value AS gender, pm4.meta_value AS dob, pm5.meta_value AS photo, pm6.meta_value AS regts, pm7.meta_value AS actemailts
        FROM {$wpdb->posts} p
            LEFT JOIN {$wpdb->postmeta} pm ON pm.post_id = p.ID
            AND pm.meta_key = '{$mk}'
            LEFT JOIN {$wpdb->postmeta} pm1 ON pm1.post_id = p.ID
            AND pm1.meta_key = '{$mk1}'
            LEFT JOIN {$wpdb->postmeta} pm2 ON pm2.post_id = p.ID
            AND pm2.meta_key = '{$mk2}'
            LEFT JOIN {$wpdb->postmeta} pm3 ON pm3.post_id = p.ID
            AND pm3.meta_key = '{$mk3}'
            LEFT JOIN {$wpdb->postmeta} pm4 ON pm4.post_id = p.ID
            AND pm4.meta_key = '{$mk4}'
            LEFT JOIN {$wpdb->postmeta} pm5 ON pm5.post_id = p.ID
            AND pm5.meta_key = '{$mk5}'
            LEFT JOIN {$wpdb->postmeta} pm6 ON pm6.post_id = p.ID
            AND pm6.meta_key = '{$mk6}'
            LEFT JOIN {$wpdb->postmeta} pm7 ON pm7.post_id = p.ID
            AND pm7.meta_key = '{$mk7}'
            WHERE pm.meta_value = '{$mv}'
            AND p.post_type = '{$pt}'
            AND p.post_status NOT IN ('draft','auto-draft')
            ORDER BY {$ord}
        ";

        $clients = $wpdb->get_results( $wpdb->prepare( $sql ), OBJECT );

if(!function_exists('add_query_meta')) {
  function add_query_meta($wp_query = "") {

      //return In case if wp_query is empty or postmeta already exist
      if( (empty($wp_query)) || (!empty($wp_query) && !empty($wp_query->posts) && isset($wp_query->posts[0]->postmeta)) ) { return $wp_query; }

      $sql = $postmeta = '';
      $post_ids = array();
      $post_ids = wp_list_pluck( $wp_query->posts, 'ID' );
      if(!empty($post_ids)) {
        global $wpdb;
        $post_ids = implode(',', $post_ids);
        $sql = "SELECT meta_key, meta_value, post_id FROM $wpdb->postmeta WHERE post_id IN ($post_ids)";
        $postmeta = $wpdb->get_results($sql, OBJECT);
        if(!empty($postmeta)) {
          foreach($wp_query->posts as $pKey => $pVal) {
            $wp_query->posts[$pKey]->postmeta = new StdClass();
            foreach($postmeta as $mKey => $mVal) {
              if($postmeta[$mKey]->post_id == $wp_query->posts[$pKey]->ID) {
                $newmeta[$mKey] = new stdClass();
                $newmeta[$mKey]->meta_key = $postmeta[$mKey]->meta_key;
                $newmeta[$mKey]->meta_value = maybe_unserialize($postmeta[$mKey]->meta_value);
                $wp_query->posts[$pKey]->postmeta = (object) array_merge((array) $wp_query->posts[$pKey]->postmeta, (array) $newmeta);
                unset($newmeta);
              }
            }
          }
        }
        unset($post_ids); unset($sql); unset($postmeta);
      }
      return $wp_query;
  }
}

$args = array (
    'post_type' => 'page',
    'meta_key' => 'someMetaKeyName',
);

// The Query
$query = new WP_Query( $args );
if($wp_query->have_posts()) {
  $wp_query = add_query_meta($wp_query);
    $i = 0;
    while($wp_query->have_posts()) {
      $wp_query->the_post();
      $post_id = get_the_id();

      //Get $someMetaKeyName in current post
      foreach($wp_query->posts[$i]->postmeta as $k => $v) {
        switch($v->meta_key) {
          case('someMetaKeyName') : {
            $someMetaKeyName = $v->meta_value;
            break;
          }
        }
      }

      //Your Code here
      //Example
      echo isset($someMetaKeyName) ? '<h3>'.$someMetaKeyName.'</h3>' : '';


      $i++;
    }
}

$args = array(
            'post_type' => 'page',
            'meta_key' => 'someMetaKeyName',
            'meta_query' => array(
                array(
                        'key' => 'someMetaKeyName',
                        'type' => 'CHAR',
                   ),
                ),
        );

    $query = new WP_Query( $args );