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var query=db.t1.Where(w=>w.t2.username=="aaa");
var query=t1.t2.Where(w=>w.username=="aaa");
var query = from a in t1
join b in t2 on a.tid equals b.tid
where a.username == "abc";
var query=from a1 in t1
join b1 in t2
on a1.id equals b1.tid
where b1.username=="aaa";
select a1;