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

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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.

PLS 021 WQ 2025 Lab Final PLS21V Winter 2025

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

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Question at position 11 In ERDs, the primary key isAn attribute that cannot be modified after it is setAn attribute that uniquely identifies each record in a database tableA graphical symbol indicating the connection between entitiesA set of optional attributes linked to an entity

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