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在新的 OpenCart 2 系统中是以下销售报告查询：

        SELECT  MIN(o.date_added) AS date_start,
            MAX(o.date_added) AS date_end,
            COUNT(*) AS orders,
            ( SELECT   SUM(op.quantity)
              FROM     fc_order_product op
              WHERE    op.order_id = o.order_id
              GROUP BY op.order_id
            ) AS products,
            (SELECT   SUM(ot.value)
              FROM     fc_order_total ot
              WHERE    ot.order_id = o.order_id
              AND      ot.code = 'tax'
              GROUP BY ot.order_id
             ) AS tax,
             SUM(o.total) AS total
    FROM     fc_order o
    WHERE    o.order_status_id > 0
    AND      DATE(o.date_added) >= '2014-12-01'
    AND      DATE(o.date_added) <= '2014-12-22'
    GROUP BY WEEK(o.date_added)
    ORDER BY o.date_added DESC

这是相当快的，但是关于税收和产品总和的结果是错误的。

旧查询

        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     fc_order_product op
                       WHERE    op.order_id = o.order_id
                       GROUP BY op.order_id
                            ) AS products,
                    (SELECT   SUM(ot.value)
                       FROM     fc_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     fc_order o
           WHERE    o.order_status_id > 0
           AND      DATE(o.date_added) >= '2014-12-01'
           AND      DATE(o.date_added) <= '2014-12-22'
           GROUP BY o.order_id
          ) tmp
    GROUP BY WEEK(tmp.date_added)
    ORDER BY tmp.date_added

给出正确的结果，但大约需要 100 秒。有没有人试图和我一起解决这个问题？

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