The primary characteristic of a key field is that it must be
2018
The primary characteristic of a key field is that it must be
- A.
a text
- B.
duplicate
- C.
a name
- D.
unique
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Correct answer: D
The correct option is D: unique. In a database management system, a key field (such as a primary key) is fundamentally used to distinctively identify each individual record or row within a table. To ensure data integrity, its values must be unique and cannot contain duplicate data.