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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")
SELECT SNO,SNAME FROM S WHERE SNAME=′王%′ SELECT SNO,SNAME FROM S WHERE SNAME=′王_′ SELECT SNO,SNAME FROM S WHERE SNAME LIKE′王%′ SELECT SNO,SNAME FROM S WHERE SNAME LIKE′王_′
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")
(Sno,Tno)和{Cno,Cname,Grade,Tno,Tname} (Sno, Cno,Tno) 和{Sno, Sname, Sex, Birthday, Cno} (Sno, Cno)和{Sno, Sname, Sex, Birthday, Cno, Cname, Grade} (Sno, Cno,Tno)和{Sno, Sname, Sex, Birthday, Tno, Tname}
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") 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
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") INSFRT INTO stu VALUES("2004001","John",50,"maths")
SELECT SNO,SNAME FROMSWHERE SNAME=’王%’ SELECT SNO,SNAME FROM S WHERE SNAME=’王_’ SELECT SNO,SNAMEFROMS WHERE SNAME LIKE ’王%’ SELECT SNO,SNAME FROM S WHERE SNAME LIKE ’王_’
SELECT sname FROM R WHERsno='2003%' SELECT sname FROM R WHERE sno LIKE '2003%' SELECT sname FROM R WHERE sno='2003_' SELECT sname FROM R WHERE sno LIKE '2003_'