计算机三级《数据库技术》考前模拟题
- 计算机三级
- 关注:1.6W次
计算机三级考试备考工作已经进入紧张冲刺阶段,下面是小编为大家整理的计算机三级《数据库技术》考前模拟题,欢迎参考~
计算机三级《数据库技术》考前模拟题1.假定学生关系是S(S#,SNAME,SEX,AGE),课程关系是C(C#,CNAME,TEACHER),学生选课关系是SC(S#,C#,GRADE)。要查找选修 "COMPUTER"课程的"女"学生姓名,将涉及到关系(d )
A.S
, C
C.S,SC
D.S,C,SC
语言中,实现数据检索的语句是(a )
CT
RT
TE
TE
3.下列SQL语句中,修改表结构的是(a )
R
TE
TE
RT
语言具有两种使用方式,分别称为交互式SQL和(c )
A.提示式SQL
B.多用户SQL
C.嵌入式SQL
D.解释式SQL
5.检索所有比 "王华"年龄大的学生姓名、年龄和性别。正确的SELECT语句是(a )
CT SN,AGE,SEX FROM S
SHERE AGE > (SELECT AGE FROM S)
WHERE SN=’王华’)
CT SN,AGE,SEX
FROM S
WHERE SN=’王华’
CT SN,ACE,SEX FROM S
WHERE AGE >(SELECT ACE
WHERE SN=’王华’)
CT SN,ACE,SEX FROM S
WHERE ACE >王华 AGE
6.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(d )
CT S# FORM SC
WHERE C#= "C2" AND GRADE> =(SELECT GRADE FORM SC)
WHERE C#= "C2")
CT S#FORM SC
WHERE C#= "C2" AND GRADE IN(SELECT CRADE FORM SC)
WHERE C#= "C2"
CT S# FORM SC
WHERE C#= "C2" AND GRADE NOT IN(SELECT GRADE FORM SC
WHERE C#= "C2"
CT S# FORM SC
WHERE C#= "C2" AND CRANDE> =ALL(SELECT GRADE FORM SC
WHERE C#= "C2")
7.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( C)
CT ,SC.C#,E
FROMS
WHERE S.S#=SC.S#
ECT ,SC.C#,E
FROM SC
WHERE S.S#=S
CT ,SC.C#,E
FROM S,SC
WHERE S.S#:S C.S#
ECT ,SC.C#,E
FROM S,SC
8.检索选修四门以上课程的学生总成绩(不统计不及格的课程),并要求按总成绩的降序捧列出来。正确的SElECT语句是( B)
CT S#,SUM(GRADE)FROM SC
WHERE GRADE >=60
CROUP BY S#
ORDER BY 2 DESC
HAVING COUNT(*) >=4
CT S#,SUM(GRADE)FROM SC
WHERE GRADE >=60
GROUP BY S#
HAVING COUNT(*) >=4
ORDER BY 2 DESC
CT S#,SUM(GRADE)FROM SC
WHERE GRADE >=60
HAVINC COUNT(*) >=4
GROUP BY S#
ORDER BY 2 DESC
CT S#,SUM(GRADE)FROM SC
WHERE GRADE >=60
ORDER BY 2 DESC
CROUP BY S#
HAVINC COUNT(*) >=4
- 文章版权属于文章作者所有,转载请注明 https://xuezhezhai.com/jsj/sanji/z450p2.html