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How to use join query in drupal7?

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<?php
    $query = db_select('xcart_products_categories', 'xpc');
    $query->join('xcart_products_lng_en', 'xpd', 'xpc.productid = xpd.productid');
    $query->join('xcart_pricing', 'xpp', 'xpc.productid = xpp.productid');
    $query->join('xcart_products', 'xp', 'xpc.productid = xp.productid');
    $query->condition('xpc.categoryid', $cid);
    $query->fields('xpc',array())
               ->fields('xpd',array('product','descr','fulldescr'))
               ->fields('xpp',array())
               ->fields('xp',array('avail','add_date'))
               ->orderBy('price', 'ASC');
    $xcart_products_info = $query->execute()->fetchAll();
?>

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