The population between the age of 25 and 44 increased by 28.1%from 1980 to 1989 because()
第1题:
It found that men in the 17-25 age ________ were the most dangerous and accident-prone group.
A limit
B range
C bracket
D section
第2题:
The period of Stone Age is during 2000--250BC.()
第3题:
对于学生信息表:student(sno,sname,sex,age,dept),能够得到年龄在20岁到22岁之间的学生的姓名和学号的语句是
A.SELECT * FROM student WHERE age BETWEEN 20 AND 22
B.SELECT sname,sno FROM student WHERE age BETWEEN 20 AND 22
C.SELECT sname,sno FROM student WHERE age>=20
D.SELECT sname,sno FROM student WHERE age<=22
第4题:
根据SQL标准,下面哪条语句与select min(age) from student等效?()
A select age from student where age >= min(age)
B select distinct age from student where age >= all min(age)
C select distinct a.age from student a where a.age<= any (select distinctb.age from student b)
D select distinct a.age from student a where a.age<= all (select distinct b.age from student b)
第5题:
根据SQL标准,要修改表student中所有学生的年龄age,使之在原值基础上减一,下面哪个语句适用?()
A update student set age = 1
B update student set age = age - 1
C update age = age -1 from student
D update from student where age = age -1
第6题:
During the ( ) Age, the making of bronze ware reached its peak.
A. Old Stone
B. New Stone
C. Iron
D. Bronze
第7题:
根据SQL标准,要查询表student中平均年龄age小于21的所在系dept及其平均年龄值,下面哪条语句适用?()
A select dept,avg(age) from student where avg(age)<21
B select dept,avg(age) from student group by dept having avg(age)<21
C select dept,avg(age) from student having avg(age)<21
D select dept,avg(age) from student group by dept where avg(age)<21
第8题:
对于学生信息表S(SNUMBER,SNAME,SEX,AGE,DEPT)(STUDENT由学号SN0,姓名SNAME,性别SEX,年龄AGE,所在系DEPT5个属性组成,其中SNUMBER为主码),求年龄20~23岁之间的学生姓名和年龄,正确的语句是( )。
A) SELECT SNAME, AGE FROM S WHERE AGE>20 OR AGE<23
B) SELECT SNAME, AGE FROM S WHERE AGE BETWEEN 20 AND 23
C) SELECT * FROM S WHERE AGE BETWEEN 20 AND 23
D) 以上均不正确
第9题:
根据SQL标准,下面哪句语句能够找出年龄最小的同学?其中age为学生表student中的年龄字段,sno为学生的学号。()
A select max(age) from student
B select sno from student where age = max(age)
C select sno from student having age = max(age)
D select sno from student a where a.age<= (select min(b.age) from student b)
第10题:
对于学生信息表STUDENT(SNO, SNAME,SEX,AGE,DEPT)(STUDENT由学号SNO、姓名SNAME、性别SEX、年龄AGE、所在系DEPT 5个属性组成,其中SNO为主码),求年龄20~23岁之间的学生姓名和年龄,正确的语句是( )。A.SELECT SNAME,AGE FROM STUDENT WHERE AGE>20 AND AGE<23B. SELECT*FROM STUDENT WHERE AGE BETWEEN 20 AND 23C.SELECT SNAME,AGE FROM STUDENT WHERE AGE BETWEEN 20 AND 23D.以上均不正确