伙计,我需要这个 sql 语句的 Lambda 表达式。
select GalleryId, Max(Bid)
from BidModels
where GalleryId in (select GalleryId from BidModels where UserId = (UserId))
group by GalleryId
伙计,我需要这个 sql 语句的 Lambda 表达式。
select GalleryId, Max(Bid)
from BidModels
where GalleryId in (select GalleryId from BidModels where UserId = (UserId))
group by GalleryId
我不明白为什么需要子查询,因为您可以选择传入 UserId = userid 的所有投标。考虑到这一点:
var userid = <whatever>;
var query = from b in BidModels
where b.UserId = userid
group by b.GalleryId into g
select new {Id = g.Key, MaxBid = g.Max(x => x.Bid)};
这是你如何做到的
var galleryIds = (bidModelses.Where(b => b.UserId == [YOURPARAMETER])
.Select(b => b.GalleryId));
var query = (bidModelses.Where(bm => galleryIds.Contains(bm.GalleryId))
.GroupBy(bm => bm.GalleryId)
.Select(gbm => new {gbm.Key, MaxBid = gbm.Max(p => p.BidId)}));
这似乎是答案感谢您的帮助:
from b in BidModels
let MyGallery = from a in BidModels where a.UserId == (1) select new { a.GalleryId }
where MyGallery.Any()
group b.Bid by b.GalleryId into g
select new
{ Id = g.Key,
MaxBid = g.Max()
}