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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”)
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")
实体完整性规则 参照完整性规则 用户定义的完整性规则 引用完整性规则
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"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" WHERE age>=20 INSERT INTO stu VALUES("2004001","John",30,"cs") INSFRT INTO stu VALUES("2004001","John",50,"maths")
实体完整性规则 参照完整性规则 用户定义的完整性规则 引用完整性规则
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("200400l","John",50,"maths")
实体完整性规则 参照完整性规则 用户定义的完整性规则 引用完整性规则