SQL Group By 的 LINQ/Lambda 查询帮助最大限度？

发布于 2024-12-11 07:21:09 字数 616 浏览 0 评论 0原文

我想知道是否有人可以帮助我根据以下 SQL 查询进行 lambda 或 LINQ 查询（最好是 lambda）。我已经尝试并取得了一些进展，但没有成功:(

SELECT TOP 1 MAX(cv.ProductID) as MaxProductID, MAX(ap.RegionAsLocationID) RegionID,
   COUNT(cv.ProductID) as ProductCount 
FROM CustomerVouchers cv
INNER JOIN Products p on p.id = cv.ProductID and p.status = 3
INNER JOIN APs ap on ap.id = p.apid
WHERE cv.Status = 1
GROUP BY cv.ProductID
ORDER BY ProductCount DESC

SQL 返回这样的结果：

MaxProductID | RegionID | ProductCount
123 | 16862 | 3

我在“最大结果”列之后，其中 MAX() 将是客户凭证记录，它是找到最多productID 的关系，

谢谢大家。

原文

I was wondering if anybody could help me with a lambda or LINQ query (preferrably lambda) based off the following SQL query. I have tried and got a little way through but no luck :(

SELECT TOP 1 MAX(cv.ProductID) as MaxProductID, MAX(ap.RegionAsLocationID) RegionID,
   COUNT(cv.ProductID) as ProductCount 
FROM CustomerVouchers cv
INNER JOIN Products p on p.id = cv.ProductID and p.status = 3
INNER JOIN APs ap on ap.id = p.apid
WHERE cv.Status = 1
GROUP BY cv.ProductID
ORDER BY ProductCount DESC

The SQL returns a result like this:

MaxProductID | RegionID | ProductCount
123 | 16862 | 3

I am after the "max result" columns where MAX() would be the customer vouchers record and it's relationships which has the most productID's found.

Thanks gang.

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淤浪 2024-12-18 07:21:09

假设 ctx 是您的实体模型，请使用以下内容。

 var result = from cv in ctx.CustomerVoucher
                         join p in ctx.Products on p.id equals cv.ProductID && p.status == 3
                         join ap in ctx.APs on ap.id equals prop.apid
                         where cv.status == 1
                         group cv by cv.ProductID into g
                         select new { MaxProductID = g.Max(cv => cv.ProductID), RegionID = g.max(ap => ap.RegionAsLocationID), ProductCount = g.Count(cv => cv.ProductID) };

Assuming ctx is your entity model, use the following.

 var result = from cv in ctx.CustomerVoucher
                         join p in ctx.Products on p.id equals cv.ProductID && p.status == 3
                         join ap in ctx.APs on ap.id equals prop.apid
                         where cv.status == 1
                         group cv by cv.ProductID into g
                         select new { MaxProductID = g.Max(cv => cv.ProductID), RegionID = g.max(ap => ap.RegionAsLocationID), ProductCount = g.Count(cv => cv.ProductID) };

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