多做题，通过考试没问题！
Oracle认证考试
睦霖题库
>
其他计算机考试
>
Oracle认证考试
Which constraint can be defines only at the column level? （）
A、UNIQUE
B、NOT NULL
C、CHECK
D、PRIMARY KEY
E、FOREIGN KEY
正确答案:
B
答案解析:
有
进入题库查看解析
微信扫一扫手机做题
最新试题
·
Given： Which t
·
User Mary has a view
·
Which statement is t
·
下列哪个操作可以将表中的数据删除，并且不
·
What is necessary fo
·
Which command&
·
Your database is run
·
You disabled&e
·
Given: Whichmethodw
·
You need to modify t
热门试题
·
Given: What is
·
A user re
·
Following is the li
·
How can
·
Online index&#
·
Given： What is
·
You are
·
You want
·
Given： What is
·
According to&#
