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设有关系模式:student(sno,same,age,dept),现利用命令:CREATE VIEW stu AS SELECT*FROM student WHERE dept=“cs”WITH C...

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UPDATE stu SET dept="maths"  UPDATE stu SET dept="maths" WHERE age>=20  INSERT INTO stu VALUES("2004001","John",30,"cs")  INSERT INTO stu VALUES("2004001","John",50,"maths")  
UPDATE stu SET dept=“maths”  UPDATE stu SET dept=“maths”WHEREage>=20  INSERT INTO stu VALUES(“2004001”,“John”,30,“cs”)  INSERT INTO stu VALUES(“2004001”,“John”,50,“maths”)  
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