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var s = (from p in ctx.mm_Tags select p).Count();
SELECT COUNT(*) AS [value] FROM [dbo].[mm_Tags] AS [t0]
SELECT COUNT(TagsID) AS [value] FROM [dbo].[mm_Tags] AS [t0]
ctx.mm_Tags.Select(a=>a.TagsID).Count()
?小白路过,打个酱油SELECT COUNT(*) AS [value]
FROM [dbo].[mm_Tags] AS [t0]
var s = (from p in ctx.mm_Tags select new{a=p.count(id)}).Count();