题目
题目
单项选择题

In RDBMS, what is a primary key?

选项
A.A key that uniquely identifies each record in a table
B.A key that establishes a relationship between tables
C.A key that restricts access to data
D.None of the above
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标准答案
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思路分析
In this question about primary keys in an RDBMS, we start by examining what a primary key is intended to do. Option 1: 'A key that uniquely identifies each record in a table' accurately captures the core purpose of a primary key. It enforces ent......Login to view full explanation

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