在MySQL中计数的问题

Question

我尝试解决问题，但我需要帮助：）

实际上这个查询有效，我得到了最后一个列中所有销售额的总和：

SELECT DISTINCT epps.SKU, epc.name , 
                 COUNT(*) FROM ERP_CUSTOMER_ORDER eco
                INNER JOIN ERP_CUSTOMER_ORDER_ITEMS_2 ecoi2 ON ecoi2.ERP_CUSTOMER_ORDER_index = eco.`index`
                INNER JOIN ERP_PROD_PRODUCT_SIZES epps ON ecoi2.prod_index = epps.ID
                INNER JOIN ERP_PROD_CATALOG epc ON epps.`SKUf ID`= epc.`index`

                        WHERE (eco.state = "processing" OR eco.state= "complete")
                            AND eco.created_at > DATE_ADD("2015-11-06",INTERVAL 12 HOUR)
                            AND eco.created_at < DATE_ADD("2015-12-06",INTERVAL 12 HOUR)
                            AND epc.attribute_set = "Contact Lenses"
                            AND eco.order_location = "KL"

GROUP BY epps.SKU
ORDER BY COUNT(*) DESC

我想要每30天销售一次的产品数量。我也想在上个月销售的产品数量。但它不起作用。这是我的新查询：

我想比较2个不同月份的销售额

SELECT DISTINCT epps.SKU, epc.name , 
                (SELECT COUNT(*) FROM ERP_CUSTOMER_ORDER eco
                INNER JOIN ERP_CUSTOMER_ORDER_ITEMS_2 ecoi2 ON ecoi2.ERP_CUSTOMER_ORDER_index = eco.`index`
                INNER JOIN ERP_PROD_PRODUCT_SIZES epps ON ecoi2.prod_index = epps.ID
                INNER JOIN ERP_PROD_CATALOG epc ON epps.`SKUf ID`= epc.`index`

                        WHERE (eco.state = "processing" OR eco.state= "complete")
                            AND eco.created_at > DATE_ADD("2015-11-06",INTERVAL 12 HOUR)
                            AND eco.created_at < DATE_ADD("2015-12-06",INTERVAL 12 HOUR)
                            AND epc.attribute_set = "Contact Lenses"
                            AND eco.order_location = "KL"
                            ),


                            (SELECT COUNT(*) FROM ERP_CUSTOMER_ORDER eco
                INNER JOIN ERP_CUSTOMER_ORDER_ITEMS_2 ecoi2 ON ecoi2.ERP_CUSTOMER_ORDER_index = eco.`index`
                INNER JOIN ERP_PROD_PRODUCT_SIZES epps ON ecoi2.prod_index = epps.ID
                INNER JOIN ERP_PROD_CATALOG epc ON epps.`SKUf ID`= epc.`index`

                        WHERE (eco.state = "processing" OR eco.state= "complete")
                            AND eco.created_at > DATE_ADD("2015-10-06",INTERVAL 12 HOUR)
                            AND eco.created_at < DATE_ADD("2015-11-06",INTERVAL 12 HOUR)
                            AND epc.attribute_set = "Contact Lenses"
                            AND eco.order_location = "KL"
                            )
FROM ERP_CUSTOMER_ORDER eco
                INNER JOIN ERP_CUSTOMER_ORDER_ITEMS_2 ecoi2 ON ecoi2.ERP_CUSTOMER_ORDER_index = eco.`index`
                INNER JOIN ERP_PROD_PRODUCT_SIZES epps ON ecoi2.prod_index = epps.ID
                INNER JOIN ERP_PROD_CATALOG epc ON epps.`SKUf ID`= epc.`index`                                          
GROUP BY epps.SKU 
ORDER BY COUNT(*) DESC

我使用了大致相同的框架，但我的结果与以前不一样。

非常感谢！ 纪尧姆

Answer 1

表演是否是您的主要关注点？如果没有，使用两个子查询并加入它们可能会很好。这样的事情（未经测试）：

SELECT * from
(
SELECT DISTINCT epps.SKU, epc.name , 
                 COUNT(*) FROM ERP_CUSTOMER_ORDER eco
                INNER JOIN ERP_CUSTOMER_ORDER_ITEMS_2 ecoi2 ON ecoi2.ERP_CUSTOMER_ORDER_index = eco.`index`
                INNER JOIN ERP_PROD_PRODUCT_SIZES epps ON ecoi2.prod_index = epps.ID
                INNER JOIN ERP_PROD_CATALOG epc ON epps.`SKUf ID`= epc.`index`

                        WHERE (eco.state = "processing" OR eco.state= "complete")
                            AND eco.created_at > DATE_ADD("2015-11-06",INTERVAL 12 HOUR)
                            AND eco.created_at < DATE_ADD("2015-12-06",INTERVAL 12 HOUR)
                            AND epc.attribute_set = "Contact Lenses"
                            AND eco.order_location = "KL"

GROUP BY epps.SKU
ORDER BY COUNT(*) DESC
) a
inner join 
(
SELECT DISTINCT epps.SKU, epc.name , 
                 COUNT(*) FROM ERP_CUSTOMER_ORDER eco
                INNER JOIN ERP_CUSTOMER_ORDER_ITEMS_2 ecoi2 ON ecoi2.ERP_CUSTOMER_ORDER_index = eco.`index`
                INNER JOIN ERP_PROD_PRODUCT_SIZES epps ON ecoi2.prod_index = epps.ID
                INNER JOIN ERP_PROD_CATALOG epc ON epps.`SKUf ID`= epc.`index`

                        WHERE (eco.state = "processing" OR eco.state= "complete")
                            AND eco.created_at > DATE_ADD("2015-10-06",INTERVAL 12 HOUR)
                            AND eco.created_at < DATE_ADD("2015-11-06",INTERVAL 12 HOUR)
                            AND epc.attribute_set = "Contact Lenses"
                            AND eco.order_location = "KL"

GROUP BY epps.SKU
ORDER BY COUNT(*) DESC
) b
on a.SKU = b.SKU and a.name = b.name

请注意，如果您的数据中没有零值，则此查询将无效（例如，对于没有销售任何镜头的月份，如果您没有行，则此查询将在任何一个月都不返回任何结果因为内部联接）。