Inner join
Muzaffar Nurillayev

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SELECT * FROM Matematika
INNER JOIN InglizTili
ON Matematika.Username = InglizTili.UserName;SELECT * FROM Matematika
INNER JOIN Informatika
ON Matematika.Username = Informatika.UserName;SELECT * FROM Matematika
INNER JOIN Informatika
ON Matematika.Username = Informatika.UserName
INNER JOIN InglizTili
ON Matematika.Username = InglizTili.Username;