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T-SQL：
select * from Articles where Title in(Select Title From Articles Group By title Having Count(*) > 1) order by title
LINQ:
from t in Articles where (from t1 in Articles group t1 by t1.Title into groupT where groupT.Count()>1 select groupT.Key).Contains(t.Title) orderby t.Title select t
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原文地址：http://www.cnblogs.com/zooni/p/5251322.html
