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UPDATE STUDENT INNER JOIN EXAM_OCENKI ON STUDENT.Student_ID = EXAM_OCENKI.STUDENT_ID SET STUDENT.STIPEND = [STUDENT].[STIPEND]*0.5 WHERE (SELECT EXAM_OCENKI.MARK FROM STUDENT INNER JOIN EXAM_OCENKI ON STUDENT.Student_ID = EXAM_OCENKI.STUDENT_ID GROUP BY STUDENT.Student_ID)>4;