设学生关系Students(Sno,Sname,Sex,Sdept,Sage,Sadd),Sno、Sname、Sex、Sdept、Sage、Sadd分别表示学生的学号、姓名、性别、所在系、年龄和住址。查询比计算机系(CS)所有学生年龄都小于其他系的学生姓名及年龄的SQL语句为: SELECT Sname,Sage FROM Students WHERE Sage ______ (SELECT Sage FROM Students WHERE ______) A.Sdept=’CS’ B.Sdept<>’CS’ C.’Sdept’=CS D.’Sdept’<>CS A: AND Sdept<>’CS’;
设学生关系Students(Sno,Sname,Sex,Sdept,Sage,Sadd),Sno、Sname、Sex、Sdept、Sage、Sadd分别表示学生的学号、姓名、性别、所在系、年龄和住址。查询比计算机系(CS)所有学生年龄都小于其他系的学生姓名及年龄的SQL语句为: SELECT Sname,Sage FROM Students WHERE Sage ______ (SELECT Sage FROM Students WHERE ______) A.Sdept=’CS’ B.Sdept<>’CS’ C.’Sdept’=CS D.’Sdept’<>CS A: AND Sdept<>’CS’;
表达条件“学生所在系是计算机系(Sdept = 'CS')、数学系(Sdept = 'MA')和信息系(Sdept = 'IS')”,应该用()。 A: Sdept IN ('CS', 'MA', 'IS') B: Sdept = 'CS' AND Sdept = 'MA' AND Sdept = 'IS' C: Sdept = 'CS' OR Sdept = 'MA' OR Sdept = 'IS' D: 以上说法都不对
表达条件“学生所在系是计算机系(Sdept = 'CS')、数学系(Sdept = 'MA')和信息系(Sdept = 'IS')”,应该用()。 A: Sdept IN ('CS', 'MA', 'IS') B: Sdept = 'CS' AND Sdept = 'MA' AND Sdept = 'IS' C: Sdept = 'CS' OR Sdept = 'MA' OR Sdept = 'IS' D: 以上说法都不对
S-L(Sno,Sdept,Sloc)属于三范式(B) 注:Sno →Sdept,Sdept→Sloc
S-L(Sno,Sdept,Sloc)属于三范式(B) 注:Sno →Sdept,Sdept→Sloc
表达条件“学生所在系不是计算机系(Sdept = 'CS')、数学系(Sdept = 'MA')和信息系(Sdept = 'IS')”,应该用 A: Sdept NOT IN('CS', 'MA', 'IS') B: Sdept <> 'CS' ANDSdept <> 'MA' ANDSdept <> 'IS' C: Sdept != 'CS' ANDSdept != 'MA' ANDSdept != 'IS' D: 以上都对
表达条件“学生所在系不是计算机系(Sdept = 'CS')、数学系(Sdept = 'MA')和信息系(Sdept = 'IS')”,应该用 A: Sdept NOT IN('CS', 'MA', 'IS') B: Sdept <> 'CS' ANDSdept <> 'MA' ANDSdept <> 'IS' C: Sdept != 'CS' ANDSdept != 'MA' ANDSdept != 'IS' D: 以上都对
计算机系年龄最大的学生的信息select *from studentwhere __________________________________ A: sdept='计算机系' and sage=(select max(sage) from student where sdept='计算机系') B: sdept='计算机系' and sage=max(sage) C: sdept='计算机系' or sage=(select max(sage) from student ) D: sdept='计算机系' or sage=max(sage)
计算机系年龄最大的学生的信息select *from studentwhere __________________________________ A: sdept='计算机系' and sage=(select max(sage) from student where sdept='计算机系') B: sdept='计算机系' and sage=max(sage) C: sdept='计算机系' or sage=(select max(sage) from student ) D: sdept='计算机系' or sage=max(sage)
17e0a6a212da224.gif关系代数练习-学生选课(题干).docx根据附件内容,查询所在院系是信息工程学院、软件学院、网络空间学院这三个学院的学生姓名、性别和所在院系,正确的SQL语句是()。 A: select sName,sSex,sDept from student where sDep='信息工程学院' and sDept='软件学院' and sDept='网络空间学院'; B: select sName,sSex,sDept from student where sDep='信息工程学院' or sDept='软件学院' or sDept='网络空间学院'; C: select sName,sSex,sDept from student where sDept in('信息工程学院','软件学院','网络空间学院'); D: select sName,sSex,sDept from student where sDept on('信息工程学院','软件学院','网络空间学院');
17e0a6a212da224.gif关系代数练习-学生选课(题干).docx根据附件内容,查询所在院系是信息工程学院、软件学院、网络空间学院这三个学院的学生姓名、性别和所在院系,正确的SQL语句是()。 A: select sName,sSex,sDept from student where sDep='信息工程学院' and sDept='软件学院' and sDept='网络空间学院'; B: select sName,sSex,sDept from student where sDep='信息工程学院' or sDept='软件学院' or sDept='网络空间学院'; C: select sName,sSex,sDept from student where sDept in('信息工程学院','软件学院','网络空间学院'); D: select sName,sSex,sDept from student where sDept on('信息工程学院','软件学院','网络空间学院');
S_T数据库关系图如下:[img=332x128]17e448fc85e997f.jpg[/img]查询与“刘晨”在同一个系学习的学生,要求显示学生学号(Sno)、姓名(Sname)及系别(Sdept)。下列SQL语句正确的是()。 A: SELECT Sno, Sname, Sdept FROM Student WHERE Sdept = (SELECT Sdept FROM Student WHERE Sname = '刘晨'); B: SELECT S1.Sno, S1.Sname , S1.Sdept FROM Student S1 , Student S2 WHERE S1.Sdept = S2.Sdept AND S2.Sname = '刘晨'; C: SELECT Sno, Sname, Sdept FROM Student WHERE Sdept IN (SELECT Sdept FROM Student WHERE Sname = '刘晨'); D: SELECT Sno, Sname, Sdept FROM Student WHERE Sdept LIKE (SELECT Sdept FROM Student WHERE Sname = '刘晨');
S_T数据库关系图如下:[img=332x128]17e448fc85e997f.jpg[/img]查询与“刘晨”在同一个系学习的学生,要求显示学生学号(Sno)、姓名(Sname)及系别(Sdept)。下列SQL语句正确的是()。 A: SELECT Sno, Sname, Sdept FROM Student WHERE Sdept = (SELECT Sdept FROM Student WHERE Sname = '刘晨'); B: SELECT S1.Sno, S1.Sname , S1.Sdept FROM Student S1 , Student S2 WHERE S1.Sdept = S2.Sdept AND S2.Sname = '刘晨'; C: SELECT Sno, Sname, Sdept FROM Student WHERE Sdept IN (SELECT Sdept FROM Student WHERE Sname = '刘晨'); D: SELECT Sno, Sname, Sdept FROM Student WHERE Sdept LIKE (SELECT Sdept FROM Student WHERE Sname = '刘晨');
【单选题】针对学生表student(sno,sname,ssex,sage,sdept),其中sno为学号,sname为姓名,ssex为性别,sage为年龄,sdept为系别。查询学生的姓名sname,系别sdept和年龄sage,显示时按系别升序排列,系别相同的再按年龄降序排列。() A. select * from student order by sdept , sage B. select sname, sdept, sage from student order by sdept , sage desc C. select sname, sdept, sage from student order by sdept desc , sage D. select * from student order by sdept desc, sage
【单选题】针对学生表student(sno,sname,ssex,sage,sdept),其中sno为学号,sname为姓名,ssex为性别,sage为年龄,sdept为系别。查询学生的姓名sname,系别sdept和年龄sage,显示时按系别升序排列,系别相同的再按年龄降序排列。() A. select * from student order by sdept , sage B. select sname, sdept, sage from student order by sdept , sage desc C. select sname, sdept, sage from student order by sdept desc , sage D. select * from student order by sdept desc, sage
查询所有非计算机系学生的信息,不正确的SQL语句是:( ) A: SELECT * FROM Student WHERE Sdept != 'CS'; B: SELECT * FROM Student WHERE NOT Sdept = 'CS'; C: SELECT * FROM Student WHERE Sdept IN ('MA', 'IS'); D: SELECT * FROM Student WHERE NOT Sdept IN ('CS');
查询所有非计算机系学生的信息,不正确的SQL语句是:( ) A: SELECT * FROM Student WHERE Sdept != 'CS'; B: SELECT * FROM Student WHERE NOT Sdept = 'CS'; C: SELECT * FROM Student WHERE Sdept IN ('MA', 'IS'); D: SELECT * FROM Student WHERE NOT Sdept IN ('CS');
使用教学(STC)数据库,与如下查询语句等价的是( )。 SELECT *FROM Student WHERE Sdept = 'CS' EXCEPT SELECT * FROM Student WHERE Sage <= 19; A: SELECT * FROM Student WHERE Sdept = 'CS' AND Sage > 19 B: SELECT * FROM Student WHERE Sdept = 'CS' AND Sage <= 19 C: SELECT * FROM Student WHERE Sdept = 'CS' OR Sage <= 19 D: SELECT * FROM Student WHERE Sdept = 'CS' OR Sage > 19
使用教学(STC)数据库,与如下查询语句等价的是( )。 SELECT *FROM Student WHERE Sdept = 'CS' EXCEPT SELECT * FROM Student WHERE Sage <= 19; A: SELECT * FROM Student WHERE Sdept = 'CS' AND Sage > 19 B: SELECT * FROM Student WHERE Sdept = 'CS' AND Sage <= 19 C: SELECT * FROM Student WHERE Sdept = 'CS' OR Sage <= 19 D: SELECT * FROM Student WHERE Sdept = 'CS' OR Sage > 19