primary key
primary key
发布时间：2025-01-12 01:36:14
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答案：主键
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- 1.primary key
- 2.primary key
- 3.A primary key in another relation is called a:
- 4.If A is the primary key of relation R(A,B,C), then AC is：
- 5.The constraint “In a base relation, NO attribute of a primary key can be null”, is called :
- 6.A. foreign key B. check C. rule D. primary key
- 7.primary
- 8.其表结构分别如下：答：use __1_;create __2__ student(sno char(10) primary key ,sname varchar(8) not null,ssex enum
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