从 SQL 中的多个表返回最大价格日期的问题

Posted 2023-03-31

【中文标题】从 SQL 中的多个表返回最大价格日期的问题

【英文标题】：Issues returning max date for price from multiple tables in SQL

【发布时间】：2020-10-03 20:57:12

【问题描述】：

第一次发帖，对 SQL 比较陌生，所以请善待：D

我尝试将股票列表拉到一起的 SQL 查询存在问题。

我需要从 StockItem_Pricing 表中提取具有最后修改日期的 SalePrice。

我已将到目前为止的查询包含在下面。

SELECT 
    sc.ChannelSKU AS 'sku',
    cb.Level_LessOrderBook AS 'quantity',
    cb.InOrderBook AS 'In Open Orders',
    cb.MinimumLevel AS 'Minimum Level',
    cb.Level AS 'Stock Level',
    si.BarcodeNumber AS 'Barcode Number',
    sp.SalePrice AS 'product_price_vat_inc',
    sp.SalePrice AS 'Retail Price',
    cb.ItemTitle AS 'Title',
    sc.Source,
    sc.SubSource,
    sp.ModifiedDate AS 'LastUpdate'
FROM 
    Stock_ChannelSKU sc
INNER JOIN 
    View_CombinedStock cb ON cb.pkStockItemId = sc.fkStockItemId
INNER JOIN 
    StockItem si ON si.pkStockItemID = sc.fkStockItemId
INNER JOIN 
    StockItem_Pricing sp ON sp.fkStockItemId = sc.fkStockItemId
WHERE  
    sc.SubSource = 'UM_8292775'

提前致谢：D

【问题讨论】：

你能更新你得到的错误吗？还是您所期望的，但实际发生了什么？

【参考方案1】：

如果你只想要一行，那么使用TOP() 和ORDER BY：

select top (1)
    sc.ChannelSKU AS sku,
    cb.Level_LessOrderBook AS quantity,
    cb.InOrderBook AS InOpenOrders,
    cb.MinimumLevel AS MinimumLevel,
    cb.Level AS StockLevel,
    si.BarcodeNumber AS BarcodeNumber,
    sp.SalePrice AS product_price_vat_inc,
    sp.SalePrice AS RetailPrice,
    cb.ItemTitle AS Title,
    sc.Source,
    sc.SubSource,
    sp.ModifiedDate as LastUpdate
from Stock_ChannelSKU sc
inner join View_CombinedStock cb on cb.pkStockItemId = sc.fkStockItemId
inner join StockItem si on si.pkStockItemID = sc.fkStockItemId
inner join StockItem_Pricing sp on sp.fkStockItemId = sc.fkStockItemId
where sc.SubSource = 'UM_8292775'
order by sp.ModifiedDate desc

如果您想要每个 sku 的最新行，那么另一种选择是 row_number():

select *
from (
    select
        sc.ChannelSKU AS sku,
        cb.Level_LessOrderBook AS quantity,
        cb.InOrderBook AS InOpenOrders,
        cb.MinimumLevel AS MinimumLevel,
        cb.Level AS StockLevel,
        si.BarcodeNumber AS BarcodeNumber,
        sp.SalePrice AS product_price_vat_inc,
        sp.SalePrice AS RetailPrice,
        cb.ItemTitle AS Title,
        sc.Source,
        sc.SubSource,
        sp.ModifiedDate as LastUpdate,
        row_number() over(partition by sc.ChannelSKU order by sp.ModifiedDate desc) rn
    from Stock_ChannelSKU sc
    inner join View_CombinedStock cb on cb.pkStockItemId = sc.fkStockItemId
    inner join StockItem si on si.pkStockItemID = sc.fkStockItemId
    inner join StockItem_Pricing sp on sp.fkStockItemId = sc.fkStockItemId
    where sc.SubSource = 'UM_8292775'
) t
where rn = 1

【讨论】：

谢谢！我可能应该更清楚，我只需要返回每个 SKU 的最后修改价格。这样我就可以导出他们需要列出的所有 sku 的每小时库存提要的结果