mysql - MySQL 中的计数问题

Question

我试图解决一个问题，但我需要帮助:)

实际上这个查询有效，我在最后几列中有所有销售额的总和:

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 天销售的产品数量。我还想要上个月销售的产品数量。然而它不起作用。这是我的新查询:

我想比较两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，但我无法得到与以前相同的结果。

非常感谢! 纪尧姆

Answer 1

在这里，性能是您的主要关注点吗？如果没有，使用两个子查询并将它们连接起来可能会很好。像这样(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，则此查询将不起作用(例如，对于没有销售任何镜片的月份，如果您没有行，则此查询将不会返回任何一个月的结果因为内部连接)。