皮皮学，免费搜题
登录
搜题
【多选题】
现有三制高职学生管理信息数据库stuDB,模式如下: student( char(11), 姓名 char(10), 性别 char(2), 出生日期 datetime ,身份证 char(18)) course(课号 char(3), 课名 char(20), 学分 int, 开课学期 int ) selectcourse(,课号,成绩,教师) 下列完成性实现正确的是( )。A.
create table student( 学号 char(11) primary key, 姓名 char(10) not null, 性别 char(2) not null default '男' check(性别='男' or 性别='女', 出生日期 datetime not null, 身份证 char(18) unique )
B.
create table course(课号 char(3) primary key, 课名 char(10) not null, 学分 int not null, 开课学期 int check(开课学期>=1 and 开课学期<=6) )
C.
create table selectcourse( char(8) primary key, 课号 char(3) foreign key references course(课号）， 成绩 int null, 教师 char(10) not null )
D.
create table selectcourse( char(11) foreign key references student(）， 课号 char(3) foreign key references course(课号）， 成绩 int null, 教师 char(10) not null constraint sno_cno_primarykey primary key(，课号） )
手机使用
分享
复制链接
新浪微博
分享QQ
微信扫一扫
反馈参考答案：
举一反三
【单选题】The school recommends parents ______ their children to swim in rivers or lakes during summer holidays. [ ]
A.
not permit
B.
do not permit
C.
mustn't permit
D.
couldn't permit
【简答题】Where does the fresh water come from? It comes from rivers, lakes and__________.
【单选题】The atmosphere is ______ much a part of the earth as its soil and water of its lakes, rivers, and oceans.
A.
so
B.
very
C.
even
D.
as
【简答题】阅读理解。 Africa is home to nearly 700 lakes and rivers. It holds the largest amount of water on earth. Because of the overuse of the lakes, natural climate changes and other factors (因素), these lakes are...
【单选题】The water in the lakes and rivers in Shandong becomes ______ because of the dry weather .
A.
less and less
B.
more and more
C.
fewer and fewer
【简答题】A．poles B．mountains C．rivers D．lakes
相关题目：
参考解析：
知识点：
题目纠错 0
发布
