Question

我从sql语言开始，所以我会尽力指出我的问题。我一直在阅读其他问题，但似乎没有人适合我。所以......

我需要从InventoryEntriesDetail表中找到每个供应商的每个项目的最后付款价格。

由于表InventoryEntriesDetail包含销售和采购文档，我已将InventoryEntriesDetail表加入InventoryEntries表并对其进行过滤以仅获取采购文档。

现在我有几行：supplier，item，date，docNr等。但我只需要每个供应商/项目的最后一条记录。

有什么建议吗？

根据要求，这是我到目前为止的地方

SELECT 
    dbo.MA_InventoryEntries.CustSupp as Supplier, 
    dbo.MA_InventoryEntriesDetail.Item as Item, 
    dbo.MA_InventoryEntriesDetail.PostingDate as Date,
    dbo.MA_InventoryEntries.InvRsn AS InvRsn, 
    dbo.MA_InventoryEntriesDetail.Qty as Qty, 
    dbo.MA_InventoryEntriesDetail.UnitValue as Price, 
    dbo.MA_InventoryEntriesDetail.DiscountFormula as Discount, 
    dbo.MA_InventoryEntriesDetail.EntryId as ID
FROM 
    dbo.MA_InventoryEntriesDetail 
    LEFT OUTER JOIN dbo.MA_InventoryEntries 
        ON dbo.MA_InventoryEntriesDetail.EntryId = dbo.MA_InventoryEntries.EntryId
WHERE 
    dbo.MA_InventoryEntries.CustSuppType = 6094849
ORDER BY 
    Supplier, 
    Item, 
    Date

一些注意事项：

最后一个EntryId并不总是我正在搜索的记录
左连接是一个必须＆＃39;因为几年前仅使用InvRsn完成了InventoryEntriesDetail（它总是在InventoryEntries（非详细信息）中）
我使用的数据库在2001年有它的第一个记录，所以我们加入的表有超过11毫升的记录

PS：感谢Chris Albert纠正这个问题。现在它更清楚了。 :)

Answer 1

您可以使用ROW_NUMBER()标识每个supplier, item分区的最后一条记录：

SELECT supplier, item, date, docNr, qty, price, DiscountFormula
FROM (
   SELECT supplier, item, date, docNr, qty, price, DiscountFormula
          ROW_NUMBER() OVER (PARTITION BY supplier, item 
                             ORDER BY date DESC) AS rn
   FROM yourtable )
WHERE t.rn = 1

如果您有多个“最后”记录并且您想要选择所有记录，则可以使用RANK()代替ROW_NUMBER()。

修改

这是猜测您的实际查询应该如何（在OP中进行编辑之后）：

SELECT Supplier, Item, Date, InvRsn, Qty, Price, Discount, ID FROM ( SELECT dbo.MA_InventoryEntries.CustSupp as Supplier, dbo.MA_InventoryEntriesDetail.Item as Item, dbo.MA_InventoryEntriesDetail.PostingDate as Date, dbo.MA_InventoryEntries.InvRsn AS InvRsn, dbo.MA_InventoryEntriesDetail.Qty as Qty, dbo.MA_InventoryEntriesDetail.UnitValue as Price, dbo.MA_InventoryEntriesDetail.DiscountFormula as Discount, dbo.MA_InventoryEntriesDetail.EntryId as ID, RANK() OVER (PARTITION BY dbo.MA_InventoryEntries.CustSupp, dbo.MA_InventoryEntriesDetail.Item ORDER BY dbo.MA_InventoryEntriesDetail.PostingDate DESC) AS rn FROM dbo.MA_InventoryEntriesDetail LEFT OUTER JOIN dbo.MA_InventoryEntries ON dbo.MA_InventoryEntriesDetail.EntryId = dbo.MA_InventoryEntries.EntryId WHERE dbo.MA_InventoryEntries.CustSuppType = 6094849 ) t WHERE t.rn = 1 ORDER BY Supplier, Item, Date

Sql查询选择每个不同的最后一行以及使用内部联接检索的其他列

1 个答案: