Database Management Exam  >  Database Management Videos  >  Postgresql: A Complete Tutorial  >  Tutorial 14- ON DELETE RESTRICT AND CASCADE

Tutorial 14- ON DELETE RESTRICT AND CASCADE Video Lecture | Postgresql: A Complete Tutorial - Database Management

40 videos

FAQs on Tutorial 14- ON DELETE RESTRICT AND CASCADE Video Lecture - Postgresql: A Complete Tutorial - Database Management

1. What is the purpose of the ON DELETE RESTRICT option in database management?
Ans. The ON DELETE RESTRICT option in database management is used to ensure that a record cannot be deleted if there are any dependent records referencing it. It restricts the deletion operation until all dependent records are removed or their references are updated.
2. How does the ON DELETE CASCADE option work in database management?
Ans. The ON DELETE CASCADE option in database management automatically deletes all dependent records when a related record is deleted. It effectively cascades the deletion operation from the parent record to all its child records, ensuring data integrity.
3. Can the ON DELETE RESTRICT option be used with multiple tables?
Ans. Yes, the ON DELETE RESTRICT option can be used with multiple tables. It can be set up in a way that when a record is deleted in one table, it restricts the deletion until all dependent records in other tables are also deleted or their references are updated.
4. What happens if the ON DELETE CASCADE option is used incorrectly in database management?
Ans. If the ON DELETE CASCADE option is used incorrectly in database management, it can lead to unintended consequences such as the deletion of important data. It is essential to understand the relationships between tables and ensure the proper setup of cascading deletions to avoid data loss.
5. How can I determine if a table has the ON DELETE CASCADE option set?
Ans. You can determine if a table has the ON DELETE CASCADE option set by examining the foreign key constraints of the table. If a foreign key constraint includes the ON DELETE CASCADE clause, it means that the table has the cascading deletion behavior enabled.
40 videos
Explore Courses for Database Management exam
Signup for Free!
Signup to see your scores go up within 7 days! Learn & Practice with 1000+ FREE Notes, Videos & Tests.
10M+ students study on EduRev
Download the FREE EduRev App
Track your progress, build streaks, highlight & save important lessons and more!
Related Searches

Tutorial 14- ON DELETE RESTRICT AND CASCADE Video Lecture | Postgresql: A Complete Tutorial - Database Management

,

Free

,

MCQs

,

Objective type Questions

,

Tutorial 14- ON DELETE RESTRICT AND CASCADE Video Lecture | Postgresql: A Complete Tutorial - Database Management

,

Tutorial 14- ON DELETE RESTRICT AND CASCADE Video Lecture | Postgresql: A Complete Tutorial - Database Management

,

Extra Questions

,

Viva Questions

,

shortcuts and tricks

,

practice quizzes

,

Previous Year Questions with Solutions

,

study material

,

ppt

,

Semester Notes

,

mock tests for examination

,

past year papers

,

pdf

,

Summary

,

Important questions

,

Sample Paper

,

Exam

,

video lectures

;