当前位置: X题卡 > 所有题目 > 题目详情

设有关系模式student(sno,sname,age),则约束“age BETWEEN 20 AND 40”属于哪一类关系完整性规则?()

查看本题答案

你可能感兴趣的试题

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_'  

热门试题

更多