29.Which two statements are true regarding constraints?

最新推荐文章于 2023-05-04 09:36:45 发布
最新推荐文章于 2023-05-04 09:36:45 发布
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分类专栏： 1z0-051 文章标签： 1z0-051
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本文链接：https://blog.youkuaiyun.com/dwj19830118/article/details/50373146
本文解析了SQL中关于约束的两个正确陈述：允许唯一约束的列存储NULL值，以及可以在表中的多个列上设置主键。通过具体示例展示了如何创建包含多个列作为主键的表。
29.Which two statements are true regarding constraints?
A.A foreign key cannot contain NULL values.
B.The column with a UNIQUE constraint can store NULLS .
C.A constraint is enforced only for an INSERT operation on a table.
D.You can have more than one column in a table as part of a primary key.
答案：BD

A,B,C 查看28题


D：正确

SQL> create table test ( a number,b number,constraints pk_ab primary key(a,b));
Table created


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