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我用内连接和左连接在一起在后面的查询,但结果只是PostTags和PostXTags之间的左连接。 我的问题是什么?我不能使用内连接和左连接在一起
from pt in db.PostTags
join xp in
(
from x in db.PostXTags
join p in db.Posts
on x.PostID equals p.PostID
where p.PostID == postID
select x
)
on pt.PostTagID equals xp.PostTagID into g
from ptxp in g.DefaultIfEmpty()
where (pt.BlogID == blogID && pt.Type == PostTags.Type.Category)
select pt;