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21、若用户执行下述语句，则他需要___ 权限。 delete from sc where grade ＜ 60
A．delete
B．delete和select
C．update和select
D．delete，select和insert
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第（37）-（38）题基于学生-课程数据库中的三个基本表： 学生信息表：s（sno, sname, sex, age, dept） 主码为sno 课程信息表：c（cno, cname, teacher） 主码为cno 学生选课信息表：sc（sno, cno, grade） 主码为（sno, cno） \从学生选课信息表中找出无成绩的元组\的SQL语句是A．SELECT * FROM sc WHERE grade=NULLB．SELECT * FROM sc WHERE grade IS ' 'C．SELECT * FROM sc WHERE grade IS NULLD．SELECT * FROM sc WHERE grade =' '
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关系SC(Sno，Cno，Grade)表示学号，课程号，成绩。现要查询平均分在90分以上的学生的学号和平均成绩，正确的语句是______。A．SELECT Sno，AVG(Grade) FROM SC WHERE AVG(Grade)＞=90 GROUP BY SnoB．SELECT Sno，AVG(Grade) FROM SC GROUP BY Sno HAVING AVG(Grade)＞=90C．SELECT Sno，AVG(Grade) FROM SC WHERE AVG(Grade)＞=90 ORDER BY SnoD．SELECT Sno，AVG(Grade) FROM SC GROUP BY Cno HAVING AVG(Grade)＞=90
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在关系SC中，查询学习课程号为\'DB\'，且成绩在60至90之间的学生学号的正确的SQL命令是（ ）。A．SELECT SNO FROM SC WHERE CNO='DB'AND GRADE BETWEEN 60 AND 90B．SELECT SNO FROM SC WHERE CN0='DB' 0R GRADE BETWEEN 60 AND 90C．SELECT SNO FROM SC WHERE CNO='DB'AND GRADE=60 AND 90D．SELECT SNO FROM SC WHERE CNO='DB'AND GRADE=60 AND GRADE=90
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假定有三个关系，学生关系S、课程关系C和学生选课关系SC，它们的结构如下： S(S#，SN，Sex，Age，Dept)，C(C#，CN)，SC(S#，C#，Grade)。其中，S#为学生号，SN为姓名，Sex为性别，Age为年龄，Dept为系别，C#为课程号，CN为课程名，Grade为成绩。检索选修课程“C2”的学生中成绩最高的学生的学号，正确的SQL．语句是______。A．SELECT S#FROM SC WHERE C#="C2" AND Grade IN (SELECT Grade FROM SC WHERE C#="C2")B．SELECT S# FROM SC WHERE C#="C2" AND Grade＞= (SELECT Grade FROM SC WHERE C#="C2")C．SELECT S# FROM SC WHERE C#="C2" AND Grade＞=ALL (SELECT Grade FROM SC WHERE C#="C2")D．SELECT S# FROM SC WHERE C#="C2" AND Gtade NOT IN (SELECT Grade FROM SC WHERE C#="C2")
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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）不及格的学生姓名（sname），以上正确的有哪些？（ ）。A．Ⅰ和ⅡB．Ⅰ和ⅢC．Ⅱ和ⅢD．Ⅰ、Ⅱ和Ⅲ
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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
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可以利用Connection对象的Execute方法实现对数据库的更改操作。下列将SC表中学号为S105的学生的成绩减少10分的语句,正确的是()。
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有如下的SQL语句：Ⅰ．SELECT sname FROMs，sc WHERE grade＜60Ⅱ．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(sname)，以上正确的有( )。A．Ⅰ和ⅡB．Ⅰ和ⅢC．Ⅱ和ⅢD．Ⅰ、Ⅱ和Ⅲ
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检索选修课程“C2”的学生中成绩最高的学生的学号。正确的SELECT的语句是______。A．SELECT S# FROM SC WHERE C#="C2" AND GRADE＞ =(SELECT GRADE FROM SC WHERE C#="C2")B．SELECT S# FROM SC WHERE C#="C2" AND GRADE IN(SELECT GRADE FROM SC WHERE C#="C2")C．SELECT S# FROM SC WHERE C#="C2" AND GRADE NOT IN(SELECT GRADE FROM SC WHERE C#="C2")D．SELECT S# FROM SC WHERE C#="C2" AND GRADE＞ =ALL(SELECT GRADE FROM SC WHERE C#="C2")
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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
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从学生选课信息表中找出无成绩的元组的SQL语句是( )。A．SELECT*FROM sc WHERE grade＝NULLB．SELECT*FROM sc WHERE grade IS"C．SELECT*FROM sc WHERE grade IS NULLD．SELECT*FROM sc WHERE grade="
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(21 ）执行 SQL 语句： SELECT sno,grsde FROM SC WHERE cno= ' c1 ' AND grade60 ，则该语句对关系 S C执行的操作有A ）交（ ∩ ）和选择（ σ ）B ）选择（ σ ）和投影（ ∏ ）C ）并（ ∪ ）和投影（ ∏ ）D) 选择（ σ ）和笛卡尔积（ × ）
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学生选课信息表：sc（sno，cno，grade），主键为（sno，cno），从学生选课信息表中找出无成绩的元组的SQL语句是（）。A、SELECT * FROM sc WHERE grade=NULLB、SELECT * FROM sc WHERE grade IS“ ”C、SELECT * FROM sc WHERE grade=‘ ’D、SELECT * FROM sc WHERE grade IS NULL
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