已知有关系“STUDENT”，则关系运算σANE＜80(STUDENT)用SQL语句表示为(52)。A．SELECT( * )FROM STUDENT WHERE AVE ＜ 80B．SELECT( * )FROM STUDENT HAVING AVE ＜ 80C．SELECT(AVE)FROM STUDENT WHERE AVE ＜ 80D．SELECT(AVE） FROM STUDENT HAVING AVE ＜ 80
已知有关系“STUDENT”，则关系运算σANE＜80(STUDENT)用SQL语句表示为(52)。
A．SELECT( * )FROM STUDENT WHERE AVE ＜ 80
B．SELECT( * )FROM STUDENT HAVING AVE ＜ 80
C．SELECT(AVE)FROM STUDENT WHERE AVE ＜ 80
D．SELECT(AVE） FROM STUDENT HAVING AVE ＜ 80
相关考题：
（40）查找学生姓名及其所选修课程号和成绩，正确的 SQL 语句是A）SELECT sname FROM student, SELECT cno,grade FROM sc WHERE student.sno =sc.snoB） FROM sname,cno,grade FROM student,course WHERE student.sno =course.cnoC） SELECT sname ,canme,grade FROM student,course,sc WHERE student.sno =sc.sno and sc.cno=course.cnoD） SELECT sname ,cno,grade FROM student,sc WHERE student.sno =sc.sno
使用SQL语句从表STUDENT中查询所有姓王的同学的信息，正确的命令是：A）SELECT*FROM STUDENT WHERE LEFT（姓名，2）＝“王”B）SELECT*FROM STUDENT WHERE RIGHT（姓名，2）＝“王”C）SELECT*FROM STUDENT WHERE TRIM（姓名，2）＝“王”D）SELECT*FROM STUDENT WHERE STR(姓名，2)=“王”
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 22B．SELECT sname，sno FROM student WHERE age BETWEEN 20 AND 22C．SELECT sname，sno FROM student WHERE age＞=20D．SELECT sname，sno FROM student WHERE age＜=22
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)B select dept,avg(age) from student group by dept having avg(age)C select dept,avg(age) from student having avg(age)D select dept,avg(age) from student group by dept where avg(age)
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 = 1B update student set age = age - 1C update age = age -1 from studentD update from student where age = age -1
根据SQL标准，创建一个视图abc，通过该视图只能对表student中系dept为‘IS’的记录进行更新操作。下面哪条语句适用?()A create view abc as select * from student where dept=’IS’B create view abc as select * from student where dept=’IS’ with check optionC create view abc as student where dept=’IS’D create view abc as select dept=’IS’ from student
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 studentB 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
根据SQL标准，要删除表student中所有数据，但不将表student的定义一起删除，下面哪个语句可以适用?()A delete from studentB delete all from studentC delete * from studentD drop table student
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.ageD select distinct a.age from student a where a.age
根据SQL标准，要查询表student中所有年龄age小于所有学生的平均年龄的记录，下面哪条语句适用?()A select * from student where ageB select * from student having ageC select * from student a where a.ageD select * from student a where (select avg(b.age) from student b ) >= a.age
查找学生姓名及其所选修课程的课程号和成绩,正确的SQL语句是A．SELECT sname FROM student,SELECT cno,grade FROM sc WHERE student.sno=sc.snoB．SELECT sname,cno,grade FROM student,course WHERE student.sno=course.cnoC．SELECT sname,cname,grade FROM student,course,sc WHERE student.sno=sc.sno and sc.cno=course,cnoD．SELECT sname,cno,grade FROM student,sc WHERE student.sno=sc.sno
对于数据表：student(sno,sname,sex,age,grade)，查询学习成绩为空的学生的学号和姓名，下面语句正确的是______。A．SELECT sno,sname FROM student WHERE gade=NULLB．SELECT sno,sname FROM student WHERE grade IS NULLC．SELECT sno,age FROM student WHERE grade IS NULLD．SELECT mo,age FROM student WHERE grade=NULL
使用SQL语句从表STUDENT中查询所有姓王的同学的信息，正确的命令是：______。A．SELECT*FROM STUDENT WHERE LEFT(姓名，2)=“王”B．SELECT*FROM STUDENT WHERE RIGHT(姓名，2)=“王”C．SELECT*FROM STUDENT WHERE TRIM(姓名，2)=“王”D．SELECT*FROM STUDENT WHERE STR(姓名，2)=“王”
试题基于如下三个关系，其中学生关系student的主码是sno，课程关系course的主码是cno，选课关系SC的主码是（sno，cno）。查找学生姓名及其所选修课程的课程号和成绩，正确的SQL语句是（ ）。A）SELECT sname FROM student,SELECT cno,grade FROM scWHERE student.sno＝sc.snoB）SELECT sname, cno,grade FROM student,courseWHERE student.sno＝course.cnoC）SELECT sname, cname,grade FROM student,course, scWHERE student.sno＝sc.Snoand sc.cno＝course.cnoD）SELECT sname,cno, grade FROM student,scWHERE student.sno＝sc.sno
对于学生信息表：student(sno，sname，sex，age，dept)，要查询所有刘姓学生的信息，正确的语句是A．SELECT * FROM student WHERE sname LIKE'刘 * 'B．SELECT * FROM student WHERE sname LIKE'刘 $'C．SELECT * FROM student WHERE sname LIKE'刘%'D．SELECT * FROM student WHERE sname LIKE'刘'
设Student为学生关系，SC为学生选课关系，Sno为学生号，Sname为学生姓名，Cno为课程号，执行下列SQL语句的查询结果是( )。Select Student.SnameFrom Student,SCWhere Student.Sno=SC.SnoAnd SC.Cno='C1’A．选出选修C1课程的学生信息B．选出选修C1课程的学生姓名C．选出Student中学生号与SC中学生号相等的信息D．选出Student和SC中的一个关系
要找出籍贯是湖北或湖南的学生的姓名和性别，下述SQL语句正确的有哪三项（）。A、SELECT Sname，Ssex FROM Student WHERE Sdept=（‘湖南’，‘湖北’）；B、SELECT Sanme，Ssex FROM Student WHERE Sdept=’湖南’ORSdept=’湖北’；C、SELECT Sname，Ssex FROM Student WHERE Sdep tLIKE‘湖%’D、SELECT Sname，Ssex FROM Student WHERE Sdept LIKE‘%湖’；E、SELECT Sname，Ssex FROM Student WHERE Sdept IN（‘湖南’，‘湖北’）；
数据库中有一张表名称为Student，有列Name，Age，IDCard，Sex。要求写SQL语句查询出表中所有的数据，下列哪个SQL语句是正确的（）A、Select* From StudentB、Select Name From StudentC、Select Name，Age，IDCard From StudentD、Select Name，Age，IDCard，Sex From Student
数据库中有一张表名称为Student，有列Number，Name，Age，IDCard，Sex。主键为Number。要求查询所有男同学信息，下列哪个SQL语句是正确的？（）A、Select* From Student Where Sex=’男’B、Select* From Student Where Number NotIn（Select Number From Student Where Sex=’男’）C、Select* From Student Where NumberIn（Select Numbe rFrom Student Where Sex=’男’）D、Select* From Student Where Sex’男’
数据库中有一张表名称为Student，有列Name，Age，IDCard，Sex。要求写SQL语句查询出表中年龄介于20和30岁之间的数据，下列哪个SQL语句是正确的？（）A、Select* From Student Where Age=20 ANDAge=30B、Select* From Student Where Age=20 ANDAge=30C、Select* From Student Where Age BET WENN 20AND30D、Select* From Student Where Age=20Age=30"
数据库中有一张表名称为Student，列ZZMM表示学生政治面貌，学生的政治面貌可能为“党员”、“团员”和群众，要求查询政治面貌为“党员”和“团圆的学生信息”，下列哪个SQL语句是正确的（）A、Select* From Student Where ZZMM=’党员’And ZZMM=’团员’B、Select* From Student Where ZZMM=’党员’Or ZZMM=’团员’C、Select* From Student Where ZZMM="党员"OrZ ZMM="团员"D、Select* From Student Where ZZMM IN（’党员’，‘团员’）
数据库中有一张表名称为Student，有列Number，Name，Age，IDCard，Sex。主键是Number，数据类型为Varchar（20）。要求写删除学号为“20140001”的学生，下列哪个SQL语句是正确的（）A、Delete Student‘20140001’B、Delete Student“20140001”C、Delete Student Where Number=‘20140001’"D、Delete From Student Where Number=”20140001”"
在Transact-SQL语法中，以下SELECT语句正确的是（）。A、SELECT * FROM studentB、SELECT * FROM student WHERE GETDATE（）C、SELECT * FROM student ORDER st_idD、SELECT * FROM student BY St_name
已知学生成绩关系表，其模式为STUDENT（学号，姓名，数学，物理，英语），完成下列查找3门课成绩都在90分以上的学生名单的SQL语句为：SELECT 学号，姓名 FROM STUDENT WHERE数学=90（）物理=90（）英语=90
填空题已知学生成绩关系表，其模式为STUDENT（学号，姓名，数学，物理，英语），完成下列查找3门课成绩都在90分以上的学生名单的SQL语句为：SELECT 学号，姓名 FROM STUDENT WHERE数学=90（）物理=90（）英语=90
多选题数据库中有一张表名称为Student，有列Number，Name，Age，IDCard，Sex。主键为Number。统计学生总人数，下列哪个SQL语句是正确的（）ASelect Count（1）From StudentBSelect Sum（*）From StudentCSelec tAvg（*）From StudentDSelect Count（*）From Student
单选题若要检索“Student”数据表中的所有记录和字段，则SQL语句为（）ASelec t姓名，性别 From StudentBSelect*From StudentCSelect 姓名，性别 From Student Where 姓名=“张山“DSelect*From Student Where 姓名=“张山“