计算机三级《数据库技术》考前模拟题
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
B.SC， C
C.S，SC
D.S，C，SC
2.SQL语言中，实现数据检索的语句是(a )
A.SELECT
B.INDERT
C.UPDATE
D.DELETE
3.下列SQL语句中，修改表结构的是(a )
A.ALTER
B.CREATE
C.UPDATE
D.INSERT
4.SQL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 )
A.SELECT SN，AGE，SEX FROM S
SHERE AGE > (SELECT AGE FROM S)
WHERE SN=’王华’)
B.SELECT SN，AGE，SEX
FROM S
WHERE SN=’王华’
C.SELECT SN，ACE，SEX FROM S
WHERE AGE >(SELECT ACE
WHERE SN=’王华’)
D.SELECT 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 )
A.SELECT S# FORM SC
WHERE C#= "C2" AND GRADE> =(SELECT GRADE FORM SC)
WHERE C#= "C2")
B.SELECT S#FORM SC
WHERE C#= "C2" AND GRADE IN(SELECT CRADE FORM SC)
WHERE C#= "C2"
C.SELECT S# FORM SC
WHERE C#= "C2" AND GRADE NOT IN(SELECT GRADE FORM SC
WHERE C#= "C2"
D.SELECT 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)
A.SELECT S.SN，SC.C#，SC.CRADE
FROMS
WHERE S.S#=SC.S#
B.SELCECT S.SN，SC.C#，SC.GRADE
FROM SC
WHERE S.S#=S
C.CRADEC.SELECT S.SN，SC.C#，SC.CRADE
FROM S，SC
WHERE S.S#：S C.S#
D.SELSECT S.SN，SC.C#，SC.GRADE
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)
A.SELECT S#，SUM(GRADE)FROM SC
WHERE GRADE >=60
CROUP BY S#
ORDER BY 2 DESC
HAVING COUNT(*) >=4
B.SELECT S#，SUM(GRADE)FROM SC
WHERE GRADE >=60
GROUP BY S#
HAVING COUNT(*) >=4
ORDER BY 2 DESC
C.SELECT S#，SUM(GRADE)FROM SC
WHERE GRADE >=60
HAVINC COUNT(*) >=4
GROUP BY S#
ORDER BY 2 DESC
D.DELECT S#，SUM(GRADE)FROM SC
WHERE GRADE >=60
ORDER BY 2 DESC
CROUP BY S#
HAVINC COUNT(*) >=4