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Select * from table where Numero_Operacion in ( Select Numero_Operacion from table group by Numero_Operacion having count(Numero_Operacion)>1 )
ありがとう!
こんなものでしょう
<Table>.GroupBy(x => x.Numero_Operacion) .Where(x => x.Count() > 1) .SelectMany(x => x)