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Which function does the PRIMARY KEY clause perform in table creation? It ensures that’s non-NULL values can act as unique keys. It ensures that non-NULL values can as candidate keys. It ensures that each value in row is unique. It ensures that each value in the column is unique

Which function does the PRIMARY KEY clause perform in table creation? It ensures that’s non-NULL values can act as unique keys. It ensures that non-NULL values can as candidate keys. It ensures that each value in row is unique. It ensures that each value in the column is unique

Database System Concepts
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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Which function does the PRIMARY KEY clause perform in table creation?

  1. It ensures that’s non-NULL values can act as unique keys.
  2. It ensures that non-NULL values can as candidate keys.
  3. It ensures that each value in row is unique.
  4. It ensures that each value in the column is unique
  5.  
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Answers:-

The primary key constraint is a uniquely identifies each record in the table.

The Primary keys must contain unique values and cannot to be  contain null values.

The table can be only one primary key in the table 

primary key can be consist of single or multiple columns

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