A Primary Key is assigned to the most unique field of information in the table.

Question

BlackTom AI · Accepted Answer

Think about the concept of a primary key in a relational table. 
Option 1: "True". The primary key is a constraint that ensures each row can be uniquely identified by the value in the key column (or a combination of columns). In practice, this means the primary key is associated with unique identification of records. However, the phrase "most unique field of information" is not standard terminology; a primary key does not have to be the most unique value in every possible sense, but it must guarantee row-level uniqueness and be stable and non-null. 
Option 2: "False". If we interpret the statement strictly, it implies the primary key corresponds to the single most unique field in the entire table, which is not required or guaranteed. A primary key can be a single column or a composite of multiple columns, and there can be other unique fields in the table that are not designated as the primary key. The essence of a primary key is not that it is the "most unique" field, but that it provides a unique identifier for each row and is chosen for stability and reliability. 
In summary, the core idea of a primary key is row-wise uniqueness and reliable identification, not necessarily selecting the singular most unique field in the dataset. The wording in the options hinges on whether you focus on the strict definition (which is about unique identification, not "most unique") and the flexibility of key composition (single or multiple columns). 
Thus, the evaluation hinges on the nuance between "uniquely identifies each row" and "the most unique field in the table"; both interpretations can lead to different conclusions depending on how strictly the wording is read.

A Primary Key is assigned to the most unique field of information in the table.判断题

类似问题

The table is the basic building block in database design. An attribute (or column) that uniquely identifies a particular object (or row) in the table is called:

If order_id is declared as a PRIMARY KEY, which of the following are guaranteed? Choose all that apply.

什么是主键？

Inspect the following conceptual model Identify the primary key of the Store entity

Each table in a relational database has one field designated as its primary:

Which of the following best describes the purpose of a primary key?

After transforming the above ERD to a Relational Schema, what is the primary Key for patient treatment?

In a relational database, which of the following about Primary Key is FALSE

更多留学生实用工具

智能学习助手

风格化写作助手

论文查重助手

文献引用助手

课堂转译助手

课堂笔记助手

Quiz搜索助手

学校历年真题

智能刷题助手

智能匹配练习

希望你的学习变得更简单