Postgresql Postgres中的相关子查询

我有一个类似下面的查询来查找某些产品的库存详细信息。该查询工作正常，但我认为它不够高效和快速（DB:postgresql版本11）

此代码中有一个CTE“结果集”，我需要查找从缺货日期到缺货日期前7天这段时间内的“订购产品的数量”（从缺货日期算起的数量）。同样，我还需要查找收入

所以我写了两个相同的子查询，一个输出收入，另一个输出数量，这不是一个有效的步骤。所以有人对如何重写它，使它成为一个有效的代码有任何建议

     WITH final as
    (
        SELECT  product_id,product_name,item_sku,out_of_stock_at
        ,out_of_stock_at - INTERVAL '7 days' as previous_7_days
        ,back_in_stock_at  
    FROM oos_base
    )
SELECT  product_id,product_name,item_sku,out_of_stock_at,previous_7_days
    ,back_in_stock_at

    ,(SELECT coalesce(sum(i.qty_ordered), 0) AS qty_last_7d_from_oos_date
          FROM ol.orders o
            LEFT JOIN ol.items i ON i.order_id = o.order_id
            LEFT JOIN ol.products p ON p.product_id = i.product_id AND i.store_id = p.store_id
          WHERE o.order_state_2 IN('complete','processing')
          AND f.product_id=p.product_id 
          AND o.created_at_order :: DATE BETWEEN f.previous_7_days::DATE AND COALESCE(f.out_of_stock_at::DATE,current_date)
    )
   ,( SELECT coalesce(sum(i.row_amount_minus_discount_order), 0) AS rev_last_7d_from_oos_date
          FROM ol.orders o
            LEFT JOIN ol.items i ON i.order_id = o.order_id
            LEFT JOIN ol.products p ON p.product_id = i.product_id AND i.store_id = p.store_id
          WHERE o.order_state_2 IN('complete','processing')
          AND f.product_id=p.product_id 
          AND o.created_at_order :: DATE BETWEEN f.previous_7_days::DATE AND COALESCE(f.out_of_stock_at::DATE,current_date)
    )
    FROM final f

在上面的代码中，CTE“final”给出了两个日期“out\u of\u stock\u at”& “前7天”。我想根据这两个日期来计算产品的数量和收入，这两个日期表示“前7天”和“缺货”

下面的查询将给出产品的数量和收入，但上述CTE中的“前7天”和“缺货”之间的时间段

到目前为止，我已经两次使用下面的代码来获取收入和数量信息

    SELECT coalesce(sum(i.qty_ordered), 0) AS qty , 
  coalesce(sum(i.row_amount_minus_discount_order), 0)
              FROM ol.orders o
                LEFT JOIN ol.items i ON i.order_id = o.order_id
                LEFT JOIN ol.products p ON p.product_id = i.product_id AND i.store_id = p.store_id
              WHERE o.order_state_2 IN('complete','processing')
              AND f.product_id=p.product_id 
              AND o.created_at_order :: DATE BETWEEN f.previous_7_days::DATE AND COALESCE(f.out_of_stock_at::DATE,current_date)

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