选择每个产品类别的最高结果

Question

以下查询正在撤回以下数据。

我只想为每个产品编号返回一个结果，只有最高的orddate，以及相关的订单总数（ordttl）和单位成本（ucost）。

实施的想法？感谢您的回复。

SELECT
ordln.pnum as 'Product Number',
prod.name as 'Product Name',
ordhd.snum,
sup.name,
ordhd.ordttl,
ORDHD.onum,
ORDHD.orddate,
ordln.ucost
FROM
scmdb.dbo.cksprodm prod (NOLOCK) 
INNER JOIN scmdb.dbo.cksordln ordln (NOLOCK) on prod.pnum = ordln.pnum
INNER JOIN scmdb.dbo.cksordhd ordhd (NOLOCK) on ordhd.onum = ordln.onum
LEFT JOIN scmdb.dbo.ckssuplr sup (NOLOCK) on ordhd.snum = coalesce(sup.snum, 
sup.asnum)
WHERE ordhd.orddate BETWEEN 
DATEADD(month,-6,dateadd(day,datediff(day,0,getdate()),0) + '06:00') AND 
GETDATE() -- order date is between 6 months ago and today.
AND ordln.pnum NOT IN (SELECT distinct PNUM 
                    FROM scmdb.dbo.cksquohd qhd 
                    inner join scmdb.dbo.cksquoln qln on qhd.quote = qln.quote
                    where qhd.qedate > GETDATE() 
                  ) 

Answer 1

您可以使用row_number按日期排名并获取最新日期的行：

SELECT *
FROM
(
    SELECT
    ordln.pnum as 'Product Number',
    prod.name as 'Product Name',
    ordhd.snum,
    sup.name,
    ordhd.ordttl,
    ORDHD.onum,
    ORDHD.orddate,
    ordln.ucost,
    row_number() over (partition by ordln.pnum order by ORDHD.orddate desc) as ranking
    FROM
    scmdb.dbo.cksprodm prod (NOLOCK) 
    INNER JOIN scmdb.dbo.cksordln ordln (NOLOCK) on prod.pnum = ordln.pnum
    INNER JOIN scmdb.dbo.cksordhd ordhd (NOLOCK) on ordhd.onum = ordln.onum
    LEFT JOIN scmdb.dbo.ckssuplr sup (NOLOCK) on ordhd.snum = coalesce(sup.snum, 
    sup.asnum)
    WHERE ordhd.orddate BETWEEN 
    DATEADD(month,-6,dateadd(day,datediff(day,0,getdate()),0) + '06:00') AND 
    GETDATE() -- order date is between 6 months ago and today.
    AND ordln.pnum NOT IN (SELECT distinct PNUM 
                        FROM scmdb.dbo.cksquohd qhd 
                        inner join scmdb.dbo.cksquoln qln on qhd.quote = qln.quote
                        where qhd.qedate > GETDATE() 
                      ) 
) t
where ranking = 1