Database Management
primer-original-v2mediumDatabase ManagementSelect Statementprimer-original-v2

Which statements are true regarding constraints?

Answer options

A
A column with the UNIQUE constraint can contain NULL values.
B
A foreign key cannot contain NULL values.
C
A constraint is enforced only for the INSERT operation.
D
A constraint cannot be disabled when the column contains data.

Correct answer: A column with the UNIQUE constraint can contain NULL values.

Detailed Solution & Conceptual Analysis

This question has been retained as-is due to its unique context.

Key Engineering Takeaway

In Database Management, understanding the underlying mechanics of Database Management is critical for writing performant, bug-free production code and passing rigorous technical architecture reviews.

Related Database Management questions

Which AWS service provides a structured approach to review and improve cloud workloads using best practices?Which AWS Well-Architected Framework pillar is dedicated to reducing costs while maintaining system performance and secu…Which AWS Well-Architected Framework pillar ensures that computing resources are used efficiently to meet performance go…Which AWS device is designed for edge computing and secure data transfer in rugged environments?Which AWS service is used to protect web applications from common web exploits like SQL injection and XSS?Which of the following database services support dynamic schema?

Practice more Database Management questions

PrimerPrep has independently reviewed practice questions and coding exercises — all free.

Database Management practice setAll subjects