题目
题目

MUF0052 ICT Unit 2 - Semester 1, 2025 4.4 Quiz: Project stages

单项选择题

In a relational database management system, what is a foreign key?

选项
A.a. A field that must have a unique value.
B.b. A foreign key is the same as a primary key.
C.c. A field that is an auto number data type.
D.d. A field in one table that is the primary key in another table.
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标准答案
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思路分析
Reiterating the question to set the stage: In a relational database management system, what is a foreign key? Then, we evaluate each answer option to see which description matches the standard definition and role of a foreign key. Option a: 'A field that must have a unique value.' This describes a candidate key or possibly a primary key, not specifically a foreign key. A field with unique values is important......Login to view full explanation

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