A.)1 个
B.)2 个
C.)3 个
D.)4 个
[单选题]查找学生姓名及其所选修课程的课程号和成绩,正确的SQL语句是A.SELECT sname FROM student,SELECT cno,grade FROM sc WHERE student.sno=sc.snoB.SELECT sname,cno,grade FROM student,course WHERE student.sno=course.cnoC.SELECT sname,cname,grade FROM student,course,sc WHERE student.sno=sc
[单选题](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 stud
[单选题]现有某高校的选修课记录(SC):学号、姓名、课程名称、成绩,要查询没有选修课成绩的学生和课程,正确的SQL语句是( )。A. SELECT学号,课程号FROM sc WHERE成绩=””B. SELECT学号,课程号FROM sc WHERE成绩=NULLC. SELECT学号,课程号FROM SC WHERE成绩IS NULLD. SELECT学号,课程号FROM SC WHERE成绩
[单选题]若要求查找选修“数据库技术”这门课程的学生姓名和成绩,将涉及关系A.S和SCB.SC和CC.S和CD.S、SC和C
[单选题]若要求查找选修“数据库技术”这门课程的学生姓名和成绩,将使用关系( )。A.S和SCB.SC和CC.S和CD.S、SC和C
[单选题]查询学生姓名及其所选修课程的课程号和成绩,正确的SQL语句是A.SELECT S.SNAME,SC.C#,GRADE FROM S WHERE S.S#=SC.S#B.SELECT S.SNAME,SC.C#,GRADE FROM SC WHERE S.S#=SC.S#C.SELECT S.SNAME,SC.C#,GRADE FROM S,SC WHERE S.S#=SC.S#D.SELECT S.SNAME,SC.C#,GRADE FROM S,SC WHERE S.S#=SC.C#
[单选题]检索学生姓名及其所选修课程的课程号和成绩,正确的SELECT语句是______。A.SELECT S.SN,SC.C#,SC.GRADE FROMS WHERE S.S#=SC.S#B.SELCECT S.SN,SC.C#,SC.GRADE FROM SC WHERE S.S#=SC.GRADEC.SELECT S.SN,SC.C#,SC,GRADE FROM S,SC WHERE S.S#:SC.S#D.SELSECT S.SN,SC.C#,SC.GRADE FROM S,SC
[单选题]检索学生姓名及其所选修课程的课程号和成绩。正确的SELECT语句是______。A.SELECT S.SN,SC.C#,SC.GRADE FROM S WHERE S.S#=SC.S#B.SELECT S.SN,SC.C#,SC.GRADE FROM SC WHERE S.S#=SC.GRADEC.SELECT S.SN, SC.C#,SC.GRADE FROM S,SC WHERE S.S#=SC.S#D.SELECT S.SN,SC.C#,SC.GRADE FROM S,SC
[单选题]若要求查找选修“数据库技术”这门课程的学生姓名和成绩,将使用关系( )。在查找的数据库“学生-选课-课程”中存在的3个关系为: S(S#, SNAME,SEX,AGE), SC(S#,C#,GRADE), C(C#,CNAME,TEACHER)A.S,SCB.SC,CC.S,CD.S,SC,C
[单选题]( 3 2 )查询学生姓名及其所选修课程的课程号和成绩,正确的 SQL 语句是A. ) SELECT S . SNAME , SC.C# , GRADE FROM S WHERE S . S # = SC . S#B. ) SELECT S . SNAME , SC.C #, GRADE FROM SC WHERE S . S # = = SC . S#C. ) SELECT S . SNAME , SC.C# , GRADE FROM S , SC WHERE S . S# = SC . S#