计算机等考三级数据库考前模拟试题
- 数据库操作系统
- 关注:3.94K次
数据是用物理符号记录下来的可以鉴别的信息。下面给大家整理了计算机等考三级数据库考前模拟试题,欢迎阅读!
计算机等考三级数据库考前模拟试题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")
- 文章版权属于文章作者所有,转载请注明 https://xuewengu.com/zh-cn/flhy/shujuku/pwo7k6.html