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var query= from cc in COPTC
join cd in COPTD
on new {cc.TC001,cc.TC002} equals new{ cd.TD001,cd.TD002}
into m
from n in m.DefaultIfEmpty()
join ma in MOCTA
on new{cd.TD001, cd.TD002,cd.TD003 } equals new{ ma.TA026,ma.TA027,ma.TA028}
where new char[]{'Y','y'}.Contains(ma.TA013)
&& new char[]{'Y','y'}.Contains(cc.TC027)
&& Convert.ToDateTime(ma.TA003) > Convert.ToDateTime("2010-07-20")
&& Convert.ToDateTime(ma.TA003) < Convert.ToDateTime("2010-12-31")
select new
{
cc,
cd
};