【单选题】有如下的SQL语句: Ⅰ.SELECT sname FROMs,sc WHERE grade<60 Ⅱ.SELECT sname FROM WHERE sno IN (SELECT sno FROM sc WHERE grade<60) Ⅲ.SELECT sname FROMs,sc WHERE s.sno=Sc.sno AND grade<60 若要查找分数(grade)不及格的学生姓名(sna...
【单选题】有如下的SOL语句: Ⅰ.SELECT sname FROM s,sc WHERE grade<60 Ⅱ.SELECT sname FROMs 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(s...
【单选题】有如下的SQL语句: Ⅰ. SELECT sname FROM s, sc WHERE grade60 Ⅱ. SELECT sname FROM s WHERE sno IN(SELECT sno FROM sc WHERE grade60) Ⅲ. SELECT sname FROM s, sc WHERE s.sno=sc.sno AND grade60 若要查找分数(grade)不及格的学生姓...