primary key
primary key
发布时间：2025-01-12 01:36:14
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答案：主键
相关试题
- 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.定义主键的关键字是PRIMARY KEY。
- 6.定义主键的关键字是PRIMARY KEY。
- 7.The constraint “In a base relation, NO attribute of a primary key can be null”, is called :
- 8.A. foreign key B. check C. rule D. primary key
- 9.【判断题】创建为primary key约束的列不能取null
- 10.中国大学MOOC: The constraint “In a base relation, NO attribute of a primary key can be null”, is called :
