Mysql 如何从正在运行的总销售额中检索每日销售额

我需要帮助。我有如下MySQL表结构。 订单不是每日订单，而是总订单。日期是时间戳 我想看看过去3天的销售趋势。我想找出他们类别中的哪个产品趋势

id、产品id、类别id、订单、日期
5,  2345,       15,    120,    2018-06-18 00:00:00
6,  2345,       15,    123,    2018-06-19 00:00:00
1,  2345,       15,    137,    2018-06-22 00:00:00
2,  2345,       15,    140,    2018-06-23 00:00:00
7,  456,        55,    127,    2018-06-18 00:00:00
8,  456,        55,    136,    2018-06-19 00:00:00
3,  456,        55,    152,    2018-06-22 00:00:00
4,  456,        55,    176,    2018-06-23 00:00:00

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谢谢

您需要按日期进行铸造，按产品id和类别id进行分组，并根据我假设的“趋势”一词按订单总数降序排列：

select product_id, cat_id, count(orders)  as total_orders
  from mytable
 where cast(date as date) >= cast(sysdate()-3 as date)
 group by product_id, cat_id
 order by count(orders) desc;

 product_id cat_id  total_orders
       2345   15         1
        456   55         1

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我解决了这个问题。谢谢

select a.product_id,a.cox-b.az sales from (
SELECT product_id,
        max(orders) AS cox
    FROM
        products
    WHERE
        date > ( CURDATE() - INTERVAL 3 DAY ) group by product_id order by cox desc) a,

(SELECT product_id,
        orders AS az
    FROM
        products
    WHERE
        date > ( CURDATE() - INTERVAL 3 DAY ) group by product_id) b 


       where a.product_id=b.product_id 
        group by a.product_id order by sales desc

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请参见编辑问题并显示所需结果。这意味着什么：“我想找到他们类别中的哪个产品趋势”？谢谢Barbaros bey。Buraya yazdiktan sonra kafam calismaya basladi。霍尔·埃蒂姆。@TariyelValiyev Birşey değil değerli dostum kolay gelsin:）