Sanırım istediğin Sql komutu bu;
SELECT * FROM Deneme WHERE Sehir IN (SELECT Sehir FROM Deneme GROUP BY Sehir HAVING COUNT(*) > 1) AND Tarih IN (SELECT Tarih FROM Deneme GROUP BY Tarih HAVING COUNT(*) > 1) AND Pist IN (SELECT Pist FROM Deneme GROUP BY Pist HAVING COUNT(*) > 1)

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