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Поясните пожалуйста sql-код

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Поясните, пожалуйста, что в следующем коде означают обращения через точку:


tmp.date_added, o.order_id, op.order_id и др.



$sql = "SELECT MIN(tmp.date_added) AS date_start, MAX(tmp.date_added) AS date_end, COUNT(tmp.order_id) AS `orders`, SUM(tmp.products) AS products, SUM(tmp.tax) AS tax, SUM(tmp.total) AS total FROM (SELECT o.order_id, (SELECT SUM(op.quantity) FROM `" . DB_PREFIX . "order_product` op WHERE op.order_id = o.order_id GROUP BY op.order_id) AS products, (SELECT SUM(ot.value) FROM `" . DB_PREFIX . "order_total` ot WHERE ot.order_id = o.order_id AND ot.code = 'tax' GROUP BY ot.order_id) AS tax, o.total, o.date_added FROM `" . DB_PREFIX . "order` o"; 


если можно еще в целом пояснить запрос.

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перед точкой это база данных op.order_id = op в данном случае это "order_product` op

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