SELECT * FROM Student INNER JOIN SC ON Student.Sno = SC.Sno语句可将Student与 SC连接起来。A对B错
SELECT * FROM Student INNER JOIN SC ON Student.Sno = SC.Sno语句可将Student与 SC连接起来。
A对
B错
参考解析
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相关考题:
“SELECT * FROM Student INNER JOIN SCON Student.Sno = SC.Sno ”语句可将 Student 与 SC连接起来。( ) 此题为判断题(对,错)。
(40)查找学生姓名及其所选修课程号和成绩,正确的 SQL 语句是A)SELECT sname FROM student, SELECT cno,grade FROM sc WHERE student.sno =sc.snoB) FROM sname,cno,grade FROM student,course WHERE student.sno =course.cnoC) SELECT sname ,canme,grade FROM student,course,sc WHERE student.sno =sc.sno and sc.cno=course.cnoD) SELECT sname ,cno,grade FROM student,sc WHERE student.sno =sc.sno
对于教学数据库的三个基本表:S(Sno,Sname,Ssex),SC(Sno,Cno,Grade),C(Cno,Cname, Teacher),其中S为学生表,SC为学生选课表,C为课程表,则对于语句:检索至少选修LIU老师所授课课程中一门课程的女生姓名,SQL语句错误的是______。A) SELECT SnameFROM S,SC,CWHERE S.Sno=SC.Sno AND SC.Cno=C.Cno AND Teacher=‘LIU’AND Ssex=‘F’B) SELECT SnameFROM S WHERE Ssex=‘F’AND Sno IN(SELECT SnoFROM SCWHERE Cno IN(SELECT Cno FROM CWHERE Teacher=‘LIU’))C) SELECT SnameFROM S WHERE Ssex=‘F’AND EXISTS (SELECT*FROM SCWHERE SC.Sno=S.Sno AND EXISTS(SELECT*FROM CWHERE Teacher=‘LIU’))D) SELECT SnameFROM S WHERE Ssex=‘F’AND EXISTS(SELECT*FROM SCWHERE SC.Sno=S.Sno AND EXISTS(SELECT*FROM CWHERE C.Cno=SC.Cno AND Teacher=‘LIU’))
对于教学数据库的三个基本表:S(Sno,Sname,Ssex),SC(Sno,Cno,Grade),C(Cno,Cname, Teacher),其中S为学生表,SC为学生选课表,C为课程表,则对于语句:检索至少选修LIU老师所授课课程中一门课程的女生姓名,SQL语句错误的是______。A.SELECT Sname FROM S,SC,C WHERE S.Sno=SC.Sno AND SC.Cno=C.Cno AND Teacher=‘LIU’AND Ssex=‘F’B.SELECT Sname FROM S WHERE Ssex=‘F’AND Sno IN (SELECT Sno FROM SC WHERE Cno IN(SELECT Cno FROM C WHERE Teacher=‘LIU’))C.SELECT Sname FROM S WHERE Ssex=‘F’AND EXISTS (SELECT* FROM SC WHERE SC.Sno=S.Sno AND EXISTS (SELECT*D.SELECT Sname FROM S WHERE Ssex=‘F’AND EXISTS(SELECT* FROM SC WHERE SC.Sno=S.Sno AND EXISTS (SELECT*
下列程序执行后,结果中将包含____条记录。 SELECT STUDENT.学号,STUDENT.姓名 FROM STUDENT INNER JOIN SKB ON STUDENT.学号=SKB.学号 WHERE SKB.成绩 BETWEEN 80 AND 100A 2B 3C 4D 5
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根据SQL标准,查询表student(sno,sname,sex,dept)中所有学生的选修课程数,其中选修记录在表SC(sno,cno,grade)中,两表中sno为关联字段。下面哪条语句合适?()A select sno,count(cno) from SCB select sno,count(cno) from studentC select a.sno,count(cno) from student a left outer join SCD select a.sno,count(cno) from SC left outer join student a
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已知有关系“STUDENT”,则关系运算σANE<80(STUDENT)用SQL语句表示为(52)。A.SELECT( * )FROM STUDENT WHERE AVE < 80B.SELECT( * )FROM STUDENT HAVING AVE < 80C.SELECT(AVE)FROM STUDENT WHERE AVE < 80D.SELECT(AVE) FROM STUDENT HAVING AVE < 80
查询student表中的所有非空email信息,以下语句正确的是()。A、Select email from student where email !=nullB、Select email from student where email not is nullC、Select email from student where email nullD、Select email from student where email is not null
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在Transact-SQL语法中,以下SELECT语句正确的是()。A、SELECT * FROM studentB、SELECT * FROM student WHERE GETDATE()C、SELECT * FROM student ORDER st_idD、SELECT * FROM student BY St_name
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单选题查询“计算机系”学生的学号、姓名、学生所选课程的课程名和成绩,正确的命令是( )。ASELECT s.学号,姓名,课程名,成绩FROM student s,score sc,course eWHERE s.学号=sc.学号,sc.课程号=c.课程号,院系='计算机系'BSELECT学号,姓名,课程名,成绩FROM student s,score sc,course cWHERE s.学号=sc.学号AND sc.课程号=c.课程号AND院系='计算机系'CSELECT s.学号,姓名,课程名,成绩FROM(student s JOIN score se ON s.学号=sc.学号)JOIN course c ON sc.课程号=c.课程号WHERE院系='计算机系'DSELECT学号,姓名,课程名,成绩FROM(student s JOIN score sc ON s.学号=sc.学号)JOIN course c ON sc.课程号=c.课程号WHERE院系='计算机系'
单选题"SELECT Student.姓名,Scores.成绩 FROM Student INNER JOIN Scores ON Student.学号=Scores.学号"语句的意思是()A连接查询Student表和Scores表B复制Student表C复制Scores表D这是一条错误语句,毫无意义
判断题SELECT * FROM Student INNER JOIN SC ON Student.Sno = SC.Sno语句可将Student与 SC连接起来。A对B错