请输入或粘贴题目内容
搜题
拍照、语音搜题，请扫码下载APP
题目内容
（请给出正确答案）
根据SQL标准，查询表student(sno,sname,sex,dept)中所有学生的选修课程数，其中选修记录在表SC(sno,cno,grade)中，两表中sno为关联字段。下面哪条语句合适？()
A select sno,count(cno) from SC
B select sno,count(cno) from student
C select a.sno,count(cno) from student a left outer join SC
D select a.sno,count(cno) from SC left outer join student a
答案
更多“根据SQL标准，查询表student（sno,sname,sex,dept)中所有学生的选修课程数，其中选修记录在表SC（s”相关的问题
第1题
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2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3题
A insert into student sdate char(7)
B add sdate char(7) to student
C append sdate varchar(7) to table student
D alter table student add sdate varchar(7)
E alter table student add sdate char(7)
F alter table student modify sdate char(7)
第4题
A insert into student values(sno=11301, sname=’snoopy’, age =20)
B insert into student(sno,sname,age) values(11301,’snoopy’,20)
C insert into student set sno=11301, sname=’snoopy’, age = 20
D insert into student values (11301, ’snoopy’, 20)
第5题
A.STUDENT表中XB(性别)为空的一条记录
B.STUDENT表中XB(性别)为空的所有记录
C.STUDENT表中XB(性别)为空的带*的记录
D.以上均错
第6题
如果学生表Student是使用下面的SQL语句创建的：
CREATE TABLE Student(SNO C(4) PRIMARY KEY NOT NULL,;
SN C(8),;
SEX C(2),;
AGE N(2) CHECK(AGE＞15 AND AGE＜30))
下面的SQL语句中可以正确执行的是( )。
A．INSERT INTO STUDENT(SNO,SEX,AGE)VALUES("S9","男",17)
B．INSERT INTO STUDENT(SN,SEX,AGE)VALUES("李安琦","男",20)
C．INSERT INTO STUDENT(SEX,AGE)VALUES("男",20)
D．INSERT INTO STUDENT(SNO,SN)VALUES("S9","安琦",16)
第7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8题
A create view abc as select * from student where dept=’IS’
B create view abc as select * from student where dept=’IS’ with check option
C create view abc as student where dept=’IS’
D create view abc as select dept=’IS’ from student
第10题
将学表STUDENT中的学生年龄(字段名是AGE)增加1岁,应该使用的SQL命令是UPDATE STUDENT【 】。
第11题
将学生表STUDENT中的学生年龄(字段名是AGE)增加l岁，应该使用的SQL命令是： UPDATE STUDENT【 】
