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Серед наведеного списку вибрати команду корегування структури об’єкта бази даних. Вибрати всі правильні відповіді:
DELETE FROM teacher WHERE id_tch=105
ALTER TABLE teacher ALTER POLECKO TYPE CHAR(25)
ALTER TABLE teacher ADD POLE1 NAM
DROP TABLE teacher
DELETE FROM student WHERE id_stud=123
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