Question

我正在寻找一种方法来生成这样的东西，按照每个月（和每年）为给定客户分组所有发票（计数）和详细资料qty_shipped（总和）。

（示例输出）

CUSTOMER_NO , YR,    MO,   COUNT_INVOICES, TOTAL_QTY_SHIPPED
18            2015,  01,   30,             300 
18            2014,  12,   65,             12323
18            2014,  11,   34,             4344

我有一个简单的发票（master pk：inv_id）表和相应的发票 - 详细信息（详细信息fk_inv_id），详细信息表由fk：inv_id连接到主服务器。表结构看起来像。

MASTER (Invoice)
inv_id
innvoice_number
customer_no
updated

DETAIL (invoices-detail )
invdet_id
inv_id
product_no
qty_shipped
qty_ordered


...

我正在尝试，但似乎没有用。它似乎错误计算了qty_shipped的总和

 SELECT customer_no,YEAR(i.updated) as yr, MONTH(i.updated) as mnth,count(i.inv_id) as  invoices_shipped ,
--subquery--
(SELECT  count(idet.qty_shipped)  
FROM invoice_details idet WHERE idet.inv_id=i.inv_id) as qty_shipped_TOTAL 
--end subquery--
FROM invoice i WHERE status="SHIPPED" AND  customer_no=18 
GROUP BY  YEAR(i.updated) DESC, MONTH(i.updated) DESC;

有什么建议吗？

Answer 1

加入：

SELECT 
     i.customer_no,
     YEAR(i.updated) as yr, 
     MONTH(i.updated) as mnth, 
     count(i.inv_id) as  invoices_shipped, 
     sum(idet.qty_shipped) 

FROM invoice i WHERE status="SHIPPED" AND  customer_no=18 

left join invoice_details idet on idet.inv_id=i.inv_id

GROUP BY  i.customer_no, YEAR(i.updated), MONTH(i.updated)

order by YEAR(i.updated) DESC, MONTH(i.updated) DESC;

在MySQL中查询如何在主 - 详细信息表中使用count和sum

1 个答案: