COMPUTER APPLICATIONS
DATABASE MANAGEMENT SYSTEMS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Primary Key is
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The value of the relation key that identifies the unique value of a relation
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Key-values that can be broken down by more than one attribute
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key connecting the two tables and completing a relationship (relationship) to the primary key
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is the minimal attribute that uniquely distinguishes each row in the table
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Explanation:
Detailed explanation-1: -What is Primary Key? The primary key is a unique or non-null key that uniquely identifies every record in that table or relation. The primary key column cannot store duplicate values that mean primary key column values are always unique.
Detailed explanation-2: -In the relational model of databases, a primary key is a specific choice of a minimal set of attributes (columns) that uniquely specify a tuple (row) in a relation (table). Informally, a primary key is “which attributes identify a record, ‘’ and in simple cases constitute a single attribute: a unique ID.
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