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');
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');
举一反三
- 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');
- 在所有学生中查询比计算机系学生平均年龄大的学生姓名，可以使用的查询语句是： A: SELECT Sname FROM Student WHERE Sage > ( SELECT AVG(Sage) FROM Student ); WHERE Sdept = 'CS' B: SELECT Sname FROM Student WHERE Sage > AVG( SELECT Sage FROM Student WHERE Sdept = 'CS' ); C: SELECT Sname FROM Student WHERE Sage > ( SELECT AVG(Sage) FROM Student WHERE Sdept = 'CS' ); D: SELECT Sname FROM Student WHERE AVG(Sage) > ( SELECT Sage FROM Student WHERE Sdept = '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');
- 【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
- 在所有学生中查询比计算机系所有学生年龄都要大的学生姓名,正确的查询语句是___________________。 A: SELECT Sname FROM Student WHERE Sage > ( SELECT MAX(Sage) FROM Student WHERE Sdept = 'CS'); B: SELECT Sname FROM Student WHERE Sage > ALL ( SELECT Sage FROM Student WHERE Sdept = 'CS'); C: SELECT Sname FROM Student S1 WHERE EXISTS ( SELECT Sage FROM Student S2 WHERE Sdept = 'CS' AND S1.Sage > S2.Sage); D: SELECT Sname FROM Student S1 WHERE NOT EXISTS ( SELECT * FROM Student S2 WHERE Sdept = 'CS' AND S1.Sage <= S2.Sage);