有如下的SQL语句:Ⅰ. SELECT sname FROM s, sc WHERE grade<;60Ⅱ. SELECT sname FROM s WHERE sno IN(SELECT sno FROM sc WHERE grade<;60)Ⅲ. SELECT sname FROM s, sc WHERE s.sno=sc.sno AND grade<;60若要查找分数(grade)不及格的学生姓名(sname),则以上正确的有哪些?()
A: Ⅰ和Ⅱ
B: Ⅰ和Ⅲ
C: Ⅱ和Ⅲ
D: Ⅰ、Ⅱ和Ⅲ
A: Ⅰ和Ⅱ
B: Ⅰ和Ⅲ
C: Ⅱ和Ⅲ
D: Ⅰ、Ⅱ和Ⅲ
举一反三
- 有如下的SQL语句.Ⅰ. SELECT sname FROM s, sc WHERE gradeⅡ. SELECT sname FROM s WHERE sno IN(SELECT sno FROM sc WHERE gradeⅢ. SELECT sname FROM s, sc WHERE s.sno=sc.sno AND grade若要查找分数(grade)不及格的学生姓名(sname),则以上正确的有哪些?( ) 。 A: Ⅰ和Ⅱ B: Ⅰ和Ⅲ C: Ⅱ和Ⅲ D: Ⅰ、Ⅱ和Ⅲ
- 有关系S(S#,SNAME,SAGE),C(C#,CNAME),SC(S#,C#,GRADE)。若要查找分数(grade)不及格的学生姓名(sname),则以上正确的有?( ) A: SELECT sname FROM s, sc WHERE grade<60 B: SELECT sname FROM s WHERE sno IN(SELECT Cno FROM sc WHERE grade<60) C: SELECT sname FROM s, sc WHERE s.sno=sc.sno AND grade<60 D: SELECT sname FROM s, sc WHERE s.sno=sc.sno OR grade<60
- 有如下的SQL语句: Ⅰ.SELECT sname FROM s, sc WHERE grade<60 Ⅱ.SELECT sname FROM s WHERE sno IN(SELECT sno FROM sc WHERE grade<60) Ⅲ.SELECT sname FROM s, sc WHERE s.sno=sc.sno AND grade<60 若要查找分数(grade)不及格的学生姓名(sname),则以上正确的有哪些?( ) A: Ⅰ和Ⅱ B: Ⅰ和Ⅲ C: Ⅱ和Ⅲ D: Ⅰ、Ⅱ和Ⅲ
- 有关系S(S#,SNAME,SAGE),C(C#,CNAME),SC(S#,C#,GRADE)。若要查找分数(grade)不及格的学生姓名(sname),则以上正确的有?( ) A: SELECT sname FROM s, sc WHERE grade<60 B: SELECT sname FROM s WHERE sno IN(SELECT Cno FROM sc WHERE grade<60) C: SELECT sname FROM s, sc WHERE s.sno=sc.sno AND grade<60 D: SELECT sname FROM s, sc WHERE s.sno=sc.sno OR grade<60
- 有关系S(SNO, SNAME, SAGE),C(CNO, CNAME),SC(SNO, CNO, GRADE)。其中SNO是学生号,SNAME是学生姓名,SAGE是学生年龄, CNO是课程号,CNAME是课程名称,GRADE是成绩。以下( )SQL语句可以实现查询选修了'C002'号课程的学生姓名。 A: SELECT SNAME FROM S, SC WHERE S.SNO=SC.SNO AND CNO='C002' B: SELECT SNAME FROM S WHERE SNO IN (SELECT SNO FROM SC WHERE CNO='C002') C: SELECT SNAME FROM S WHERE SNO = (SELECT SNO FROM SC WHERE CNO='C002') D: SELECT SNAME FROM S WHERE SNO NOT IN (SELECT SNO FROM SC WHERE CNO='C002')