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select * from PX_KPTX where ID not in (select FID from PX_KPTX)
var Query =
(from px1 in PX_KPTX
select new{px.ID,...})
.Except
(from px2 in PX_KPTX
select {px2.PID,....})
var result = from s in PX_KPTX where !(from c in PX_KPTX select c.FID).Contains(s.ID) select s;