我希望能够提取包含类别中产品的最后一张发票 Category->Product->Invoice
(from p as Product in cat
where p.InvoiceList.Where(function(o) o.InvoiceDate >= MAX_ONE)
select p.InvoiceList.Where(function(o) o.InvoiceDate >= MAX_ONE)
).FirstOrDefault()
我似乎无法弄清楚如何完成这项工作。
编辑:一个可以实现我的目标的示例 SQL 语句。如果我能翻译它...
SELECT TOP 1 i.InvoiceID, i.InvoiceDate, i.TotalAmount
FROM Category as c INNER JOIN
Product as p ON p.categoryID = c.categoryID INNER JOIN
InvoiceProducts as ip ON ip.productID = p.productID INNER JOIN
Invoice as i ON ip.InvoiceID = i.InvoiceID
WHERE c.categoryID = 3
ORDER BY InvoiceDate DESC