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.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.The primary winding of ( ) is in series in a primary system (circuit).
- 8.primary
- 9.primary prevention
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