关系数据库模式是

database2

Quiz
•
Computers
•
1st Grade
•
Hard

Shiwen Zhang
Used 6+ times
FREE Resource
7 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
关系模型的集合
关系模式的集合
关系子模式的集合
存储模式的集合
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
同一个关系模型的任两个元组值
不能完全相同
可以完全相同
必须完全相同
以上都不对
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
一个关系只有一个
超码
外码
候选码
主码
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
关系模式的字段
不可再分
可再分
不同字段的域不能相同
以上都不对
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
以下选项中,不属于关系性质的是
关系的列必须是同质的
关系中元组的顺序可以改变
关系中列的顺序可以改变
关系中不同字段的域不能相同
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
下面哪个语句可以查看全部的数据库信息
show database;
以上都不对
show all databases;
show DataBases
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
以下哪个语句可以删除数据库mystudy
drop databases mystudy;
delete database mystudy;
drop database if not exists mystudy;
以上都不对
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